Having 17 achievements with 0 missable. The game breaks slightly from the classic hidden object formulae by adding a cool Speedrun mode. The full completion should take you about 30 minutes. As such, the walkthrough will be fairly brief but comprehensive, primarily using images of completed areas for reference, as well as a supplementary video walkthrough.
If you spot any errors or would like to advise ways to improve the walkthrough, please comment on the Walkthrough Discussion Page.
There are 3 levels, you will have to complete each twice. Once on Normal Mode and then again in Speedrun Mode. Normal Mode has no restrictions and an unlimited hint function, each level has 100 or more cats so they will still take a bit of time.
In the walkthrough I will use images of the completed levels to show where all cats are on each level. I recommend first doing it on Normal mode and getting a feel for the level, before moving on to the Speedrun challenges.
The images will start in the top left then go down, then move to the top right and move down again. So in order: Top Left, Middle Left, Bottom Left, Top right, Middle Right and Bottom right.
If you prefer a video guide or want it as reference feel free to use this:
Level 1
As mentioned earlier start level one on normal mode and collect all 100 cats shown on this level.
Once you have collected all the cats on this level you should have unlocked:
Now return to the main menu and select Speedrun Mode for level 1. Use the above images or the video as a guide (on a second monitor/device) to follow along. Don't stress about going fast, just focus on being thorough and getting all cats in under 4 minutes (this actually gives plenty of leeway). It might take a few attempts but thankfully you can retry it as much as you need.
Once you do get all the Cats in under 4 minutes you will unlock:
I am speed!Finish the first level in less than 4 minutes

Level 2
Same process as level one except this time there are 105 cats.
Once you have collected all the cats on this level you should have unlocked:
Same as earlier return to the main menu and select Speedrun Mode but for level 2 this time and use the above images or the video as a guide (on a second monitor/device) to follow along. Don't stress about going fast, just focus on being thorough and getting all cats in under 4 minutes (this actually gives plenty of leeway). It might take a few attempts but thankfully you can retry it as much as you need. This level is quite a bit harder as there are more cats and several that are well hidden, don't be surprised if it takes several attempts.
However once you do get all the Cats in under 4 minutes you will unlock:
Level 3
The third and final level has 102 cats.
Once you have collected all the cats on this level you should have unlocked:
For the last time return to the main menu and select Speedrun Mode for level 3 and use the above images or the video as a guide (on a second monitor/device) to follow along. Don't stress about going fast, just focus on being thorough and getting all cats in under 4 minutes (this actually gives plenty of leeway). It might take a few attempts but thankfully you can retry it as much as you need.
When you successfully complete it, you will unlock:
All being well that should be your completion! Congrats!