Flappy Bird for the Altera DE0. Created for individual learning benefit. Named after the great prof Dr. Naraig Manjikian.

https://cpulator.01xz.net/?sys=nios-de0&loadasm=share/sBFbr73.s&lang=c

Press "continue" three times to play, then type keys in the JTAG console.

The flickering is likely due to the limitations of the web based tool, a real board doesn't have these problems.