From GameBrew - a wiki dedicated to Video Game Homebrew.
Croahh Hero is a DS homebrew game developed with PAlib.
It is presented to the Dev-fr Silly Compo 2008 with the theme Music.
Locate the matching part on the top screen that grows on the frog from the bottom screen.
If you touch the right part, the frog makes a nice noise, otherwise it makes a nasty noise.
The game ends shortly and will tell you how well you performed.
Does not works on DeSmuME.