IPM Invader is a Arcade game developed by IPM (which would later become known as Irem) in 1979. It is a complete ripoff of the original Space Invaders. It uses a color monitor instead of a black and white monitor with a color overlay.
It has the addition of the famous 'coffee break', whereas after every 3rd wave or pattern of invaders, the 'coffee break' appears. Another unique feature in IPM Invader is the 'capsules'. When dip switch settings are changed to advanced settings, the game becomes more difficult with the introduction of the UFO (mystery score ship) dropping 'capsules' that hatch into new invaders. The 'capsules' cannot be destroyed until they hatch, and are dropped across the screen to defeat the players 'narrow column' strategy.