Baldi's Basics Classic Remastered is an improved version of and bundle including the original Baldi's Basics in Education and Learning as well as Baldi's Birthday Bash.

Upon first time boot, you will see a retro-style launcher with a few options: one to start the game, one to visit the website, and one to close the game. Clicking the option to start playing brings you to the BBCR title screen, with only one option... "PLAY!" This retro-style launcher can be disabled in the game's settings.

From there, you will be met on a simplistic looking chalkboard-style menu with "Play!", "Options", "How To Play", and "Credits"
_ When selecting 'play' a second time, you will immediately notice 3 options of styles to select in the form of doors that you can interact with. The doors are as follows:

• WASD/Arrow Keys - Move
  
• Left Click/E - Interact
  
• Right Click/Q - Use
  
• Space - Look Back
  
• Scroll Wheel/1-3 - Select Item
  
• ESC - Pause menu

As of v1.1, two more controls were added that are specifically for if you need a way to reset settings.
Pressed for 5 seconds on either the launcher screen or during the transition from the Basically, Games! logo to the warning screen, these controls are:

• CTRL - Resets control mappings
  
• Alt - Resets all other settings

You will know if these worked by the 'ding!' sound effect that plays.

All modes take you back to that classic map, but with various changes and improvements! For instance, you actually start in front of a bus, and can go through the doors at the start of the game into the (very small) outdoor area. There are more windows spread out throughout the schoolhouse as well, allowing better visibility for the player and even a couple options for shortcuts if you can break the glass. Please note, vending machines in most modes are single-use!

Beating the 3 different shown styles will unlock an optional change to gameplay, known as "Fun Settings"!

Classic Style doesn't have much changes from the original game, aside from the map changes that all 3 styles share.
_ However, do note that beating Classic Style unlocks "Mirror Mode"!

Party Style dresses most characters for the party, puts all the items into a gift box and shuffles them, adds some more items locations in general, there's balloons that float about inside of rooms (even drifting out into the hallways sometimes), and even slightly different behaviour from the original ending of Birthday Bash. Additionally, this is the only mode where the vending machines aren't single-use only.
_ While the layout of the upper floor to Party Mode is largely unchanged, there is some adjustments to how the upper level looks/feels, and the balloon code is randomized! (So unfortunately, you do have to count the balloons yourself)

Beating this mode unlocks "Lights Out"!

Demo Style has a lot more randomness thrown into the mix thanks to the items appearing in different locations (in slightly increased quantity), different characters that can appear, and the inclusion of random events.
Plus features found in Demo Style:

• Math Machines (Including Baldi stopping to praise you)
  
• A chance to get Chalkles, Cloudy Copter, and/or Beans
  
• Naturally spawning Faculty Nametags!*
  
• Gravity Chaos, the Fog event, the Flood, and Baldi breaking his ruler

Beating this mode unlocks "Hard Mode"!

*other Plus items exist in the game but do not spawn naturally/randomly in this mode; They can be used if the right conditions are met

Mirror Mode and Lights Out are simpler changes that can drastically affect the player's run. Mirror mode flipping the map horizontally, and Lights out making the schoolhouse pitch black except an ambient glow around the player and a white light emitting from Principal of the Thing. Please note that the Lights Out option does not affect NPC vision!

Hard Mode, however, changes numerous aspects such as:

• NPC Interactions
  
  - Some NPC timers are faster (e.g Beans' gum recharge, Chalkles spawning in)

  - Playtime now has 10 fast jumps instead of 5

  - AnC teleports Baldi closer to you than usual

  - Principal cannot lose you while aggro'd

  - Gotta Sweep's sweeping is harder to escape from
• Solving Math
  
  - YCTP doesn't pause

  - All 3 questions after 2nd notebook are solvable*

  - Math Machines have 3 questions each**
• Detention
  
  - Uses 15 second increments from 15-60, afterwards jumping to 99 seconds

*Baldi still speeds up with every notebook gotten, regardless of the fact you can solve every question- hinted at by the YCTP still printing text you'd normally only see if you get math wrong. Getting questions wrong on top of this just makes Baldi even angrier!
**Math Machines will spit out the notebook as soon as you get a question wrong, and Baldi will only congratulate you if you get all 3 questions correct. You can leave a machine incomplete and come back to it later if need be.

Beating any of the 3 story modes with all of the above options enabled may get you something new...

As of v1.1, a 4th option known as Free Run was added. This disables Baldi entirely and makes it so you can explore the map to your heart's content, even being able to go through the yellow doors at the beginning without collecting a single notebook. Enabling Free Run mode also disables achievements and secrets, however.

Press 'P' to wave - Originally left in by mistake, if you press 'P' before angering Baldi, he'll replay his welcome intro! (Complete with audio)

Rare death screen - Occasionally, upon dying, you will be met with a scene of Baldi crying in front of a bluescreened device in a dark room, with the text "Oh no! A critical error has occured! The game will now close." As mentioned, the game closes after this.
After NULL is beaten, getting this death screen will result in it loudly glitching out. It will then show a lake picture with Null in it, before that too glitches out and Null is removed from the picture, before going dark. This will only happen once and the game still closes afterwards.

Rare YCTP interaction - There's a rare chance that Baldi will show up in the YCTP and make a strange, loud noise.

Rare Orange Baldi - When loading into a mode, there's a chance one of the floating Baldi heads will be replaced with a splotchy-looking, orange, eyeless variant.

Crying Baldi - above the Party Style's schoolhouse on the other side of the wall that 0th Prize was originally on, there's a large room with debug textures that contains the same crying Baldi from the rare death screen.

bladder's simples in education school scary grandma game - a secret room with a purple, slightly misshapen Baldi, poking fun at Baldi's Basics bootlegs. The room is located near the eastern wall's exit between the classroom and faculty room. There are two chalkboards on the wall, one of which stating the title of the bootleg, the other stating: "don't end up like me! If you make bootleg baldi games, you'll end up trapped in the walls of here school... forever!"
_ You can use a Portal Poster to reach this room, as it shares two valid walls with two different rooms

Face room - another secret room, this time on the west side by the conjoined faculty rooms. All surface textures are a reddish high-contrast closeup of a face, with a spinning sphere bearing the same texture in the middle.
_ You can use a Portal Poster by the middle-most BSODA machine to see this room

Chalk Baldi Death Pose - In Baldi's Basement, if you manage to leave the Shrink Machine room after it's locked by using the Principal's Keys, head to the room with the math books and you will be able to see a chalk drawing of Baldi laying in the "Family Guy death pose" in the middle of the room

Due to the spoiler-y nature of this section, it will be heavily censored via spoiler tags.

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For codes that alter gameplay, the code will get disabled upon re-inputting the code. If you want to disable a code and keep playing: type it in again! (Simply restarting works, too)
Music Room - "04281989"
This code takes you to a room with multi-coloured lights and many buttons on the walls, where you can play and mess around with several songs from Baldi's Basics! Since this doesn't alter gameplay and instead teleports you, you can exit this room like a normal level.
_ The YCTP text for this is "Let's listen to some tunes!"
Code location: Principal's office in Party style, floating close to the ceiling by door
Authentic Mode - "10181996"
This code resets the game, and when you enter it again your screen will be much smaller with several HUD elements along the borders. The control scheme is also altered, namely: You have to turn with the keyboard, you must press the lever on the staminometer to toggle sprinting, and the mouse cursor is unlocked.
_ YCTP text states: "If Baldi's Basics was really released in 1999!"
Code location: Baldi's office, on wall across from Baldi
Chaos mode - "11211994"
Heed the warning the YCTP gives: "EPILEPSY WARNING! HIGHLY UNSTABILITY" This code 'corrupts' the game with crash-like sound as it resets, breaking several things. NPCs will spawn with every notebook you get, and in Demo Style random events will happen much more frequently. This mode is prone to bugs, mostly due to how many NPCs are spawned.
Code location: Shrink Machine room in Baldi's basement, on wall by cabinets
Debug/cheats - "09241993"
This code will reset the game, and when you enter a mode afterwards you will have the ability to access a secret menu in the pause screen, which lets you give yourself a number of items, make the items infinite, as well as give yourself speed, invincibility, and the ability to noclip.
_ You must unlock the ability to use this code by finding all secrets. If the condition is met, the YCTP will read "Press the question mark in the corner!", otherwise it will say "Find all the secrets first!" Please note, using the cheat menu code will disable secret content!
Code location: mystman12's office closet, wall opposite the doorway

Note: Codes are typically revealed in ending locations after beating the secret mode (see below), but the debug code can be seen early due to how the room is set up.
Classic: Answer all questions wrong and escape the schoolhouse to get sent to Baldi's Office for some tips - unlocks "Baldi's Office" achievement.
Party: Purchase a Dangerous Teleporter from a vending machine and take it to the upper floor. Use it to get sent to the bottom floor after blowing out the candle and go to the Principal's Office - unlocks "Baldi's Song" achievement.
_ There is a second variant if you go there whilst the red Baldloons are active.
Demo: Answer all math machines, then go back for the bonus questions. After answering the 6 bonus questions, you will get a Portal Poster. In the classroom between the Principal's Office and Cafeteria, place it on the corner of the wall opposite the Math Machine (away from the door) to find the entrance to the basement - unlocks "Baldi's Basement" achievement.
_ Portal may fail to place place if Chalkles is in that corner.
Note: Beating the secret mode (see next section) affects these endings... Not how you get them, though!
Accessing
NULL is a secret game style only accessible after beating any of the 3 story modes with all fun settings active (Earning the "Wow wasn't that FUN?!?!?!" achievement as well).
_ You must click on the Baldi in the corner of the style select screen (once unlocked) to enter. You'll know for sure that it's unlocked if Baldi and the text glitch out when you hover over him.

Unlocking it is just the first part of the challenge; You won't actually be able to do anything until you find the other secrets of the game, i.e the alternate endings mentioned above. Once done, you can grab the notebooks and move on.
Gameplay
NULL is initially somewhat similar to other modes in terms of layout and features:
It has similar item placements as Classic, and more items and Plus content like Demo. However, it's just you versus Null (who works similar to Baldi) and there's no math involved.
_ Null moves in the same step-like fashion as Baldi, but is very quiet and can catch you off guard with his speed. To keep track of him, the player can listen to any doors he opens passively as he walks by them, occasionally hear an angry rant, and see the lights dim around his position.
_ Stealth is definitely key in this mode, but be careful- Null can both see and break through windows, pausing doesn't actually pause, and you cannot quit without losing!

Soon after getting 3/4 exits, the gameplay changes drastically into a boss fight. Avoid Null chasing you down and creating roadblocks to alter your path, and throw objects to deal damage! Beating this mode unlocks the "Glitches Galore" achievement, whilst finishing the ending unlocks the "NULL" achievement. As mentioned above, completing this also affects the alternate endings for the 3 main modes and reveals hidden YCTP codes.
Part... two?
Beating NULL mode turns it into 'Glitch Style', a functionally near-identical mode with a red baldloon chasing you instead, readable text on the style select screen, and the ability to quit without being caught immediately.