Press space or click the screen to move the cat to a random position. Try not to lose to spikes/spikeballs and complete the three levels.
This is actually a remake of one of my oldest projects, it was unshared, it was on my other account (Scratcherx-) and its name was "Get the cat in the box." @griffpatch for the diamond count. If the score is 1 initially then click the green flag again.