When you find a hidden bonus room during play use the cursor keys to move around (up and down are reversed). If you scroll the screen all the way to the right and let wonderdog go off the right side, he will appear back in the main game, but will start walking to the right and the level will end.
2-"LEMONADE" | 4-"ULTIMATE" | 6-"LUCOZADE"
3-"PHARMACY" | 5-"DANIELLE"