Part 22 of my Random Dungeons series shows you how to build a machine that opens a portal to generate endless waves of enemies. The machine can only be stopped by throwing your sidekick through a small maintenance door. This machine will be 1 of 3 identical machines that players must destroy in the final boss battle for my randomly generated dungeon crawler, Return to Atlantis.

Here is a logic diagram that shows how to connect the Creativi-toys that I used:

Enjoy!