Flappy Bird on a graphing calculator, running smoothly. One key flaps, gravity does the rest, and the pipes keep coming until you clip one.
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One control, three speeds
Tap ENTER (or the up arrow) to flap. That's the whole control scheme, which is exactly why it's so hard to stop playing.
The home screen offers NORMAL, FAST, and INSANE. Each speed keeps its own high score, so a lucky run on NORMAL doesn't inflate your INSANE record.
When you crash, the screen freezes on the moment of impact and shows your score over it. ENTER goes again, CLEAR returns to the menu.