Original game created by dB-SOFT in 1983.
Logical + action game with 200 scenes, intro, final screen, and password after each 5 scenes.
Version for SHARP MZ-800 computer released by dB-SOFT in 1984. Written in machine language.
Ported to several platforms (Sharp, Nintendo Entertainment System, NEC, Fujitsu, MSX, and others).
See Flappy on Wikipedia.