Viki Spotter: Undersea has a total of 298 Steam achievements, none of which are missable (as any level can be played at any time as all are unlocked at the start), completion time is in the region of 40 minutes.

There are 24 levels to play with one achievement awarded for each level completed and the remaining 273 achievements are awarded for spotting differences in the levels with 1 achievement awarded for each difference found, the number of differences in each level varying between 10 and 14.

There is no randomness in the levels and the solution for each level always remains the same, leaving no replayability. I've added video walkthroughs of my gameplay below, editing out thinking time, which you can refer to if you get stuck.

This is my fourth Viki Spotter title and the first where I found some bugs, thankfully none game breaking.

1. Unlike the other Viki Spotter games that I have played, Undersea does not have an end of level screen. When you find the final difference in a level the achievement pops for finding all of the differences in the level and then... nothing.

In previous titles I have played there is an end of level screen where you can return to the main menu or continue to the next level, in Undersea this does not happen. For a brief moment after completing the first level I thought my game had bugged out or locked up, but no... rather at the end of each level you have to manually exit to the main menu and locate the next level, which can be annoying as they aren't numbered.

2. There are differences in some levels that... aren't differences. I found at least 3 examples of this and I do not doubt there may be more, one example is level 5...

The boat on the top image has three sails, the boat on the bottom image has four. This is clearly a difference, but it is not actually a difference you can select/highlight, despite it being one.

Another example is on level 15, the bottom image shows a bubble under the tail fin of the left most fish and on the top image, this bubble is not there, again a difference that cannot be selected and is not counted as a difference.

All I can say is if you can spot a difference and have clicked on it half a dozen or more times and it doesn't register, then this is just an example of a difference that isn't.

3. Sometimes two or three differences are one and on another level they are two or three... an example of a lack of continuity.

An example, in level 24, the diver in the top image is wearing two red flippers and in the bottom image he is wearing two blue flippers, in this level this is counted as 1 difference. In level 16 the diver in the top image is wearing two yellow, red and blue flippers and the diver in the bottom image is wearing two red and blue flippers... and this is counted as two differences.

This is not the only example and is something to be aware of in this rather sloppy entry in the Viki Spotter series.

For anyone with problems viewing the embedded videos in this guide (such as those in China having to use a VPN to watch videos on YouTube) here's a link to the playlist...
https://www.youtube.com/playlist?list=PLgrKGjfHCc0i1ZSX-sMlWTFsGrcwTARqu

I hope you found this guide of help, all comments, suggestions and criticism (constructive) is gratefully received.

An A to Z list of my Steam achievement guides and walkthroughs can be found @ https://cs2bus.com/sharedfiles/filedetails/?id=1502405720
If you would like to get a notification in your activity feed when I post a new guide, just click the "follow anrkyuk" button on my profile guide list...
https://cs2bus.com/id/anrkyuk/myworkshopfiles/?section=guides