For the ones who don't know the original game, see the original game play. There you can see the 4 minigames. Mad Tunnel recreates the third one, and it can be seen after minute 12.

There are other videos in youtube, you can also find reviews of the game itself...Silmarils, the company that was behind this game does not longer existst, but I tried to contact the original authors about this exercise, so far no response...