1. How do you use the z-axis once you unlocked the Keeping the Peeping Down plan?
Press the middle mouse button or wheel. Make sure to hold it down and move the mouse up or down, not the wheel itself if it's a mouse wheel. Moving the mouse up allows you to view your character's z-axis from the bottom, and down for the top view.

2. Some of these challenges are too insane to grind. Are they worth it?
Not really other than getting some extra plans and stats. All characters' level 999 stats are the same as Re;Birth 1 and 2 without the stats earned from the challenges. These just give your characters a little extra kick for end-game content and are not mandatory to make them functional.

3. Does running away and Destroy Symbols/Symbol Gains halt my challenge progress?
No. Challenges such as Victory Spotlight, Bore Chore, Killing Girl, Intrusive Girl, Shy Girl, All By Myself and EXP Thief still give you credit even when you run away or use Destroy Symbols/Symbol Gains plans.

4. What is a leader skill?
Once you learn it for a character, they give themselves and other party members special power ups when you set them as "LEADER" on the menu. There are some limitations such as leader skills only working for Humans/Makers or only CPUs.

5. What is All Up Plan? HP Up Plan?
A plan that raises all your character's stats: STR, VIT, INT, MEN, AGI, TEC, and LUK. All Up 1, 2, and 3 all give +100 to all these stats making it +300 total per character. HP Up is +500 HP for every plan, and there's 3 for each character for a total of +1,500 HP bonus HP.

6. Are the challenges character exclusive?
Yes. For example, if you got the Keeping the Peeping Down plan for Neptune, you have to get the Tier 2 I Love Gravity challenge for the other characters too if you want the plan for them.

7. I am Level 999 already, is it still possible to get Tough Stuff and Meat Shield even when I'm all overpowered and endgame geared?
Yes. You can find a monster that inflicts poison and the damage taken counts towards these challenges. You can also remove your characters' defense gears so they take more damage. Note that you only need a character to take more than 50% of their HP as damage every battle for Tough Stuff.

Challenge involving moving (this includes jumping distances) a certain number of meters as a leader. You can get Leader Skills for each character at 10,000m (Tier 3) for 36MB each and they are very useful especially Nepgear and Cave.

Tier 1: 1,500m: AGI+2
Tier 2: 5,000m: AGI+4
Tier 3: 10,000m: Leader Skills Plan
Tier 4: 21,000m: AGI+5
Tier 5: 48.195m: AGI+5
Tier 6: 100,000m: AGI+8
Tier 7: 300,000m: AGI+8
Tier 8: 5,000,000m!!!: MOV+1

Challenge involving jumping a certain amount of times as the leader. 2nd Tier grants the Keeping the Peeping Down plan which allows you to control the Z-axis rotation on the equip screen and view your Neptunia girls/waifus upskirt/downshirt goodies.

Tier 1: 10 times: TEC+2
Tier 2: 100 times: Keeping the Peeping Down Plan
Tier 3: 350 times: TEC+5
Tier 4: 700 times: TEC+5
Tier 5: 1,400 times: TEC+5
Tier 6: 2,800 times: TEC+8
Tier 7: 5,000 times: TEC+8
Tier 8: 10,000 times!!!: TEC+100

Challenge involving the successful usage of symbol attacks and connecting with the enemy as the leader. Destroy symbols/Symbol gains plans work with this challenge so you can save some time, but it still pretty grindy.

Tier 1: 10 times: STR+2
Tier 2: 100 times: STR+4
Tier 3: 250 times: STR+5
Tier 4: 500 times: STR+5
Tier 5: 1,000 times: STR+5
Tier 6: 2,000 times: STR+8
Tier 7: 3,000 times: STR+8
Tier 8: 6,000 times!!!: STR+100

Challenge involving picking up item boxes and harvest spot items (blue boxes with ?'s on them) as the leader. Counts per item box/harvest point, not item quantity, so if you got Strength Booster x3 from an item box, you only get credit for 1.

Tier 1: 10 times :LUK+2
Tier 2: 50 times: LUK+4
Tier 3: 100 times: LUK+5
Tier 4: 150 times: LUK+5
Tier 5: 200 times: LUK+5
Tier 6: 250 times: LUK+8
Tier 7: 300 times: LUK+8
Tier 8: 350 times: LUK+100

Challenge involving fighting battles alone... absolutely alone. This means no one other than the leader, even backrow characters. Working on this challenge helps with EXP Thief challenge for the non-participants.

Tier 1: 5 times: INT+2
Tier 2: 20 times: INT+4
Tier 3: 40 times: INT+5
Tier 4: 60 times: All Up 2 Plan
Tier 5: 80 times: INT+5
Tier 6: 100 times: INT+8
Tier 7: 120 times: INT+8
Tier 8: 140 times: INT+100

Challenge involving characters participating in the front row during battle. This means, up to 4 characters at once can get credit for this challenge per battle if you have a full party.

Tier 1: 100 times: HP+20
Tier 2: 300 times: HP UP 1 Plan
Tier 3: 800 times: HP+35
Tier 4: 2,000 times: HP+35
Tier 5: 5.000 times: HP+35
Tier 6: 9,000 times: HP+40
Tier 7: 15,000 times: HP UP 3 Plan
Tier 8: 30,000 times!!!: HP+300

Challenge involving characters participating in the backrow (not active in battle but give benefits to active members through their Lily ranks). Like Intrusive Girl, up to 4 characters can get credit towards this challenge at once per battle.

Tier 1: 100 times: LUK+2
Tier 2: 300 times: LUK+4
Tier 3: 800 times: LUK+5
Tier 4: 2,000 times: LUK+5
Tier 5: 5,000 times: LUK+5
Tier 6: 9,000 times: LUK+8
Tier 7: 15,000 times: LUK+8
Tier 8: 30,000 times!!!: LUK+100

All non-participants in the party get credit towards this challenge. Backrow characters are still considered participants, so they don't get credit towards this challenge.

Tier 1: 10 times: AGI+2
Tier 2: 30 times: AGI+4
Tier 3: 80 times: AGI+5
Tier 4: 200 times: AGI+5
Tier 5: 500 times: AGI+5
Tier 6: 900 times: AGI+8
Tier 7: 1,500 times: AGI+8
Tier 8: 3,000 times!!!: AGI+100

Challenge involving running away. NOTE: This challenge does not credit you if you have the 100% Escape Plan ON. Only the character who succeeds in running away gets the credit. For example, Plutia, Peashy, and Neptune are trying to run away from battle. Peashy and Plutia both fail and then Neptune finally succeeds. Only Neptune gets credit towards the challenge.

Tier 1: 10 times: INT+2
Tier 2: 30 times: INT+4
Tier 3: 80 times: INT+5
Tier 4: 200 times: INT+5
Tier 5: 500 times: INT+5
Tier 6: 900 times: INT+8
Tier 7: 1,500 times: INT+8
Tier 8: 3,000 times!!!: INT+100

Challenge involving characters' item usage IN BATTLE only. Even if the item doesn't cure a negative status effect or heal any HP amount, you will still get credit for it.

Tier 1: 50 times: MEN+2
Tier 2: 100 times: MEN+4
Tier 3: 200 times: MEN+5
Tier 4: 500 times: MEN+5
Tier 5: 1,000 times: MEN+5
Tier 6: 2,000 times: MEN+8
Tier 7: 5,000 times: MEN+8
Tier 8: 10,000 times!!!: MEN+100

Challenge involving characters' SP and EX skill usage in battle. Like "Take Your Meds!" challenge, if the SP skill heals, it doesn't need to heal any damage/status effect. The 2nd Tier unlocks EXE Drive Skills plans, so make sure to get it as soon as possible!!!

Tier 1: 50 times: MEN+2
Tier 2: 100 times: Acquire Skill Plan
Tier 3: 200 times: MEN+4
Tier 4: 500 times: MEN+5
Tier 5: 1000 times: MEN+5
Tier 6: 2000 times: MEN+8
Tier 7: 5000 times: MEN+8
Tier 8: 10,000 times!!!: MEN+100

Challenge involving the number of switches the characters perform in battle. Switch doesn't work if there's nobody in the backrow. You can switch as many times as you want in battle as long as you stay alive.

Tier 1: 50 times: All Up 1 Plan
Tier 2: 100 times: LUK+4
Tier 3: 200 times: LUK+5
Tier 4: 500 times: LUK+5
Tier 5: 1,000 times: LUK+5
Tier 6: 2,000 times: LUK+8
Tier 7: 5,000 times: LUK+8
Tier 8: 10,000 times!!!: LUK+100

Simple yet grindy challenge involving how many enemies a character has defeated. Even enemies defeated through the Destroy Symbols/Symbol Gains plans are also counted!

Tier 1: 100 foes: STR+2
Tier 2: 500 foes: STR+4
Tier 3: 1,000 foes: STR+5
Tier 4: 2,500 foes: STR+5
Tier 5: 6,000 foes: STR+5
Tier 6: 10,000 foes: STR+8
Tier 7: 20,000 foes: STR+8
Tier 8: 50,000 foes!!!: STR+100

Challenge involving the amount of HP characters have taken as damage in battle. This challenge comes naturally once you do high level Colosseum fights.

Tier 1: 10,000 HP: HP+20
Tier 2: 20,000 HP: HP+30
Tier 3: 50,000 HP: HP+35
Tier 4: 100,000 HP: HP UP 2 Plan
Tier 5: 150,000 HP: HP+35
Tier 6: 300,000 HP: HP+40
Tier 7: 600,000 HP: HP+50
Tier 8: 1,200,000 HP: HP+300

Challenge involving HP amounts characters have been healed with (receiving the heals). HP restored from incapacitation also count. The source could either be item or SP skills. Only HP that was lost and restored count, so if you have full HP when healed, you don't get credit for anything.

Tier 1: 3,000 HP: VIT+2
Tier 2: 6,000 HP: VIT+4
Tier 3: 12,000 HP: VIT+5
Tier 4: 24,000 HP: VIT+5
Tier 5: 48,000 HP: VIT+5
Tier 6: 96,000 HP: VIT+8
Tier 7: 250,000 HP: VIT+8
Tier 8: 500,000 HP: VIT+100

Challenge involving characters' total hit counts. Note that if a move has some sort of Area of Effect (AoE), you can multiply your hit counts easily by hitting multiple enemies at once. Example: An 8-hit rush combo hitting 3 enemies at once gives you 24 hits towards the challenge's progress.

Tier 1: 100 Hits: STR+2
Tier 2: 500 Hits: STR+4
Tier 3: 1,000 Hits: STR+5
Tier 4: 2,500 Hits: STR+5
Tier 5: 6,000 Hits: STR+5
Tier 6: 10,000 Hits: All Up 3 Plan
Tier 7: 20,000 Hits: STR+8
Tier 8: 50,000 Hits!!!: STR+100

Challenge involving characters getting the final hit that ends the battle and striking their victory pose. The 5th tier gives an amazing bonus: A 5th combo string for the character! Note this is only for 1 category (Rush, Power, Break) and is different for each character. You can unlock the other 5th combo strings by clearing Stella's Dungeons areas or treasures in dungeons.

Tier 1: 10 times: TEC+2
Tier 2: 20 times: TEC+4
Tier 3: 40 times: TEC+5
Tier 4: 80 times: TEC+5
Tier 5: 100 times: Add Combo Slot Plan
Tier 6: 250 times: TEC+8
Tier 7: 500 times: TEC+8
Tier 8: 1,000 times!!!: TEC+100

Challenge involving flawless victories (no damage) in battle. If it's a full party, only the 4 frontrow characters get credit for it. Note that if you get hit for 0 damage, it is considered "damage" so you will not get credit towards the challenge if that happens.

Tier 1: 10 times: AGI+2
Tier 2: 20 times: AGI+4
Tier 3: 40 times: AGI+5
Tier 4: 80 times: AGI+5
Tier 5: 100 times: AGI+5
Tier 6: 250 times: AGI+8
Tier 7: 500 times: AGI+8
Tier 8: 1,000 times!!!: AGI+100

Probably the most confusing challenge of all since its description is vague in-game. You can't just sit on red HP and fight battles... You need to actually lose the HP EVERY battle. If a character took more than 50% of her HP total in a battle, even if it's healed afterwards, you will get credit towards this challenge.

Tier 1: 10 times: Menu Voices
Tier 2: 20 times: VIT+4
Tier 3: 40 times: VIT+5
Tier 4: 80 times: VIT+5
Tier 5: 100 times: VIT+5
Tier 6: 250 times: VIT+8
Tier 7: 500 times: VIT+8
Tier 8: 1,000 times!!!: VIT+100

I thought I should add this since it has something to do with Marathon Runner challenge. Leader skills affect the entire party (as well as they meet the requirement, i.e. if they are CPU or human) and is based on the current Leader of the party.

Neptune - HDD SP Down - Reduces HDD Transformation cost by 100 SP (50% Reduction). This does not include Awakening!

Nepgear - HDD Shares+ - Raises all CPU party members' hidden stats even more based on the number of Share they have in their nations. e.g. With Planeptune at 80% shares, this makes Neptune and Nepgear insanely powerful!
Note: Peashy and Plutia are considered Planeptune CPUs.

Plutia - Lightning DEF+ - Raises lightning element resistance

Noire - Fire DEF+ - Raises fire element resistance

Uni - Break GP ATT+ - Raises damage on foes' guard break gauges especially with Break attacks

Blanc - Ice DEF+ - Raises ice element resistance

Rom - INT+ when HP at max - Self explanatory

Ram - MEN+ when HP at max - Self explanatory

Vert - Wind DEF+ - Raises wind elemental resistance

Peashy - Critical ATT+ - Raises damage when your attacks score a critical hit

Histoire - Power Up Extend+ - Duration of stat buffs increases

Kei Jinguji - Directional DEF+ - Raises defense when attacked from the sides/behind

Mina Nishizawa - Break Attack Cooldown- - Reduces turn delay when performing Break attacks

Chika Hakozaki - Power Attack Cooldown- - Reduces turn delay when performing Power attacks

IF (Teen) - Rush Attack SP+ - Restore more SP when performing Rush attacks

IF (Child) - Rush Attack Cooldown- - Reduces turn delay when performing Rush attacks

Compa (Teen) - Item HP Recovery+ - Restore more HP with items

Compa (Child) - Status Recovery Time+ - Recover from abnormal status much faster naturally

RED - Power Attack SP+ - Restore more SP when performing Power attacks

Broccoli - Break HP DMG+ - Break attacks do more damage

Cave - Rush HP DMG+ - Rush attacks do more damage

5pb. - Break Attack SP+ - Restore more SP when performing Break attacks

Tekken - Power Attack DMG+ - Power attacks do more damage

Falcom (Older) - Human Char STR+ - All non-CPU characters gain additional STR

Falcom (Younger) - Human Char VIT+ - All non-CPU characters gain additional VIT

CyberConnect2 - Human Char TEC+ - All non-CPU characters gain additional TEC

MarvelousAQL - Human Char INT+ - All non-CPU characters gain additional INT

MAGES. - Human Char MEN+ - All non-CPU characters gain additional MEN

This section is a collected info of all tips and suggestions I can give on how to grind these challenges efficiently. Feel free to PM me if you know other methods and I'll give your name a mention!

First off, let's divide each challenge grind methods into 4 different categories and note which challenges belong to what method. Some challenges may belong in more than 1 method:

1. Battle Only Method = Challenges in this category require you to ACTUALLY BATTLE and perform the following actions. You cannot get any counts for these challenges with destroy symbol/symbol gains or running away. Challenges in this category include:
- Special Girl
- Take Your Meds!
- Pass the Baton
- Meat Shield
- That's So Nice!
- Until You Cry
- Tough Stuff

2. Destroy Symbols Method - By activating both Destroy Symbols and Symbol Gains, you can finish off enemies instantly with a symbol attack as long as you outlevel them greatly and a random character strikes their winning pose and reward you with EXP/Credit/Items. This method is loads more efficient than Battle Only method for some challenges. Challenges that benefit from this include:
- Symbol Queen
- All By Myself...
- Intrusive Girl
- Shy Girl
- Killing Girl
- EXP Thief
- Victory Spotlight
- Bore Chore

3. Run Away Method - Special thanks to My1 for this. Notably faster than Destroy Symbols Method for some challenges as running away keeps the monster on the field and you don't have to wait for them to respawn. Challenges that benefit from this include:
- It's Not A Loss!
- Symbol Queen (turn off Destroy Symbols)
- Intrusive Girl
- Shy Girl
- All By Myself
- Until You Cry (grind this challenge on tough enemy, and when they are about to die, just run away)

4. Field/Dungeon Only - This category is exclusive to challenges that don't require you to battle and just performing actions in the dungeon such as:
- Marathon Runner
- I Love Gravity
- Three Second Rule!

Exclusive Challenge Tips
This section is more dedicated in analyzing each challenge and giving specific tips/tricks on how to grind them faster.

Marathon Runner - Possibly the longest challenge in the game. You probably won't even get close to getting someone to 500,000m in your entire playthrough of this game if you are just aiming for all characters' leader skills and the amount required to max someone's Marathon Runner challenge is 5 FREAKING MILLION meters for +1 MOV. It is simple to do but it just takes forever and can vary depending on your game's FPS. Low FPS/Laggy computer obviously will make this challenge a living hell for you.
- This challenge is not worth grinding while you are "awake". This is one of those challenges that you do while you are AFK.
- This is not possible with a keyboard/mouse unless you can do some serious key binding/macroing/auto hotkey shenanigans.
- The "taped" controller method - Basically involves rubber banding/tapping the left and right analog stick in the same direction so you would run in circles. Note that you don't get any credit by running into a wall. You need to be moving and your screen/background is changing or in this case, rotating.

I Love Gravity -10,000 jumps is a lot for maxing this Challenge but the TEC+100 is freaking awesome and might help you beat those crazy tough bosses early by allowing you to actually hit them consistently.
- Turn off Jumping Star Plan. What goes up must come down and if you are jumping too high, it takes longer to come down obviously...
- N Box method - Go underneath one of those N Mario Boxes and start jumping like mad. Reason: Your jump is halted by the box thus you don't go up all the way and it reduces the time it takes for you to come down. You are still given the jump count even when you hit the box!!!
- Extra Info: With the N Box method, tall characters like Vert and Mina almost never jump more than a couple feet and it's much easier to grind this challenge for them.

Symbol Queen - Successful Symbol attacks only. A character swinging their weapon and connecting = successful.
- If you touch an enemy when you have Guaranteed Symbol Attack plan on, it may say "Symbol Attack" in battle, but this DOES NOT COUNT towards Symbol Queen.
- The "Run Away" method above is much more efficient than Destroy Symbols method as it keeps the enemy alive and you can symbol attack them again!

Three Second Rule! - Picking up items whether they are the light blue item boxes or the blue ? harvest item boxes will give you credit for this. Max is just 350 so it's not too bad.
- If the dungeon has 2 areas, rezoning from one area to another respawns the harvest item boxes!
- Find a map with lots of harvest spots. The second area of the "volcano" map layouts have several harvest spots within close proximity of each other.

All By Myself... - Has one of the All Up Plans and easily achieved with 60 encounters. Maxing it out is at 140 battles which is also not a lot.
- First off remove all your characters until you only have your leader.
- Use the "Run Away" method for this if you want to do it faster.
- EXP Thief is credited to those you removed but only if you are doing the "Destroy Symbols" method.

Intrusive Girl/Shy Girl - I put them in the same category because they are pretty much identical except the stat gains. Intrusive Girl has a Tier 7 that gives an HP Up plan but it won't be easy. 15,000 encounters is A LOT. Max Tier is 30,000 ENCOUNTERS!!! Note that you don't have to win these so you can use the "Run Away" method.
- There's really no way to shortcut this other than the "Run Away" method.

EXP Thief - It has synergy with All By Myself... if you decide to use Destroy Symbol method.
- Find a dungeon easy to navigate and has a lot of enemies.
- Start hacking away with Symbol Attacks with Destroy Symbol/Symbol Gains on with just 1 character, your Leader. Every character you benched (not active) gets credited towards this challenge.

It's Not A Loss! - Run away! Duh.... need I say more?
- Run Away method. Reminder that you will not get credit if you have the 100% Escape plan ON.

Take Your Meds! - Get ready to visit the shop often if you are grinding this challenge. Buy 99 of every consumable item if you can so you'll have less trips in between.
- Enter a battle and just start using those items up. There's no shortcut to this. Start eating up the first item on your list until it gets to 0 and work your way down.
- Equip some discs with Bullet Hell and partner up with characters with Cooldown Reduction like IF and CyberConnect2 so you get more turns.

Special Girl - Tier 2 is really all that's worth getting. Gives bonuses to MEN but MEN is not a useful stat in this game as most enemies resort to physical attacks...
- Use low SP cost skills like buffs.
- As long as the skill is executed successfully, it doesn't matter if it heals or buffs someone who is full or already buffed...
- Restock your SP items often.

Pass the Baton - Switch, switch, switch! That's all you need to do.
- Like Take Your Meds!, the key to this challenge is getting the most turns possible, so equip Bullet Hell discs and Cooldown Reduction partners.

Killing Girl - 50,000 enemies is insane!!! What is this? A Dynasty Warriors game?
- Like EXP Thief challenge, just start hacking away enemies with symbol attacks using the Destroy Symbols/Symbol gains method. It's faster this way than battling them.

Meat Shield - If you are at end game, this is one of those "gimme" challenges. 1,200,000 HP damage is easily met as end game enemies can easily pound 20-40k HP per attack and even at your entire party.
- To maximize this challenge, you can just remove your defensive gears so you take the most damage possible. Careful not to die and waste resurrection items though.

That's So Nice! - It has good synergy with Meat Shield. Every time someone gets beat up really hard, just heal them up. 500,000 HP isn't a lot
- % HP recovery items are more effective in endgame when everyone has 50-70k HP.
- Best saved for endgame when your enemies are also strong and can hit you for massive damage so you can heal up more amounts.

Until You Cry - This challenge has varying amounts of difficulty. 10,000 is needed for that amazing All Up Plan and 50,000 to max out this challenge. Cave easily breezes through this challenge because of all her multi hit SP skills and the decent SP return on those skills gives her an easy time to spam infinitely but others will struggle a bit on this one.
- Skill usage is faster than Rush attacks but requires extensive use of items and much more expensive to maintain.
- Auto SP recovery discs are recommended for this challenge to alleviate the cost of SP items.
- Use 1x3 range weapons so you can hit many enemies at once if you decide to just Rush Attack them. Use rush attacks with the most hits obviously.

Victory Spotlight - Tier 5 has that nice Combo Slot Plan and it's only 100 victory poses.
- Destroy Symbols method. From this method, the one posing is random if your party is full but you can always just put the leader by herself if you want to grind for 1 specific character.

Bore Chore - What you need to know about this challenge: "0" damage is still damage. "Miss" is not damage.
- Destroy Symbols method. All front row characters get this which makes it 4x faster with a full party.

Tough Stuff - The most time consuming challenge to grind for just because you can't AFK with this like Marathon Runner.
- A character needs to lose 50% or more of their HP from the battle and win! If you are grinding for a specific character, if they strike their victory pose like they have struggled a bit (example: RED falling down on her butt, most girls holding their arms like they have been severely injured), then you got credit for the challenge.
- It is attainable by front row characters and even back row characters if you switch them!
- This is easier to grind in end game or when you are fighting an enemy much tougher than you.
- Poison method - Find an enemy that can poison you and just let your HP deplete until you lose 50% or more of your HP already then finish them off.

And that concludes the challenge walkthrough!!!

Feel free to comment or make suggestions on the guide especially if you know any more shortcuts/tips on how to grind specific challenges much easier (without the use of hacks or cheat engine)! Thanks again Steam and IF for bringing this game for us to enjoy!