Tetris (NES, Nintendo)
The Nintendo Entertainment System is specified to run at 60.0988 frames per second.
Rotation system is a right-handed Nintendo Rotation System. Lock delay, wall kick, and hard drop are not present. DAS initial delay is 16 frames, and then every 6 frames. Soft drop speed is 1/2G. ARE is present, at or less than 10 frames.
The following table of gravity speeds was observed and later found to be stored at $808E (offset $099E in the iNES format ROM):
|Level||Number of frames|
In Marathon (called A-TYPE), when the number of lines cleared is greater than or equal to 10 times the current level, add 1 to the current level. When the player chooses a high starting level, sometimes the levels start changing sooner; what makes this happen is as of yet unclear.