Use the arrow keys to move the cat/player. Get the checkpoints (green flags)! Don't touch spikes (Black & red things). The bright yellow stuff are doors that can be opened by taking a key. Jump on enemies to defeat them! You can go forward and backward levels! Also, if the place number ( the variable on the bottom left) happens to go up by 100 then don't worry, it's normal and it's necessary for the levels going up. If the game is laggy, you can always go to TurboWarp. TurboWarp link: https://turbowarp.org/600971479
Credit to @griffpatch for the videos used to make Scratch Cat's Adventure. And also credit to some other Scratcher for the music.