3D Block

3D Block is an unofficial Blockout variant for the NES.

Level Select
At the title screen, press A, B, Up, Down on Controller 1, then press A to increase the level number counter. Normally, you can select only the first 10 levels, but with this cheat you can select levels 11-20 as well.

Easter Egg
At the title screen, press A, B, Up, Down on Controller 1, then press Select 10 times. This will show the Easter egg from the ending: the girl's silhouette will change color and show the actual nude picture.