Nintendo published the first official version of Tetris for Nintendo Entertainment System. Unlike Tetяis, this game has no 2-player mode.
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The Nintendo Entertainment System is specified to run at 60.0988 frames per second. It was first published in North America in 1985 by Nintendo Entertainment.
Rotation system is a right-handed Nintendo Rotation System. Lock delay, wall kick and hard drops were not implemented. Softdrops were allowed, and the players were rewarded 1 point per cell (Max of 20). DAS initial delay is 16 frames, and then every 6 frames. Soft drop speed is 1/2G. ARE is 10~18 frames depending on the height at which the piece locked; pieces that lock in the bottom two rows are followed by 10 frames of entry delay, and each group of 4 rows above that has an entry delay 2 frames longer than the last; line clear delay is an additional 17~20 frames depending on the frame that the piece locks; the animation has 5 steps that advance when the global frame counter modulo 4 equals 0. As a consequence, the first step of the line clear animation is not always a set number of frames.
The following table of gravity speeds was observed and later found to be stored at $898E (offset $099E in the iNES format ROM):
| Level | Frames per Gridcell |
|---|---|
| 00 | 48 |
| 01 | 43 |
| 02 | 38 |
| 03 | 33 |
| 04 | 28 |
| 05 | 23 |
| 06 | 18 |
| 07 | 13 |
| 08 | 8 |
| 09 | 6 |
| 10–12 | 5 |
| 13–15 | 4 |
| 16–18 | 3 |
| 19–28 | 2 |
| 29+ | 1 |
In Marathon (called A-TYPE), when the player line clear (startLevel * 10 + 10) or max(100,startLevel*10-50) lines, whatever comes first, the level advances by 1. After this, the level advances by 1 for every 10 lines.
- Start at level 5, advance to level 6 at 60 lines, advance to level 7 at 70 lines.
- Start at level 12, advance to level 13 at 100 lines, advance to level 14 at 110 lines.
Due to the way that line clear math works (shifting a decimal number, then forgetting to convert from hexadecimal to decimal), lines after level 20 also behave oddly.
| Level | Lines before level increases | Total Lines before level 29 |
|---|---|---|
| 0 | 10 | 290 |
| 1 | 20 | 290 |
| 2 | 30 |
290 |
| 3 | 40 |
290 |
| 4 | 50 |
290 |
| 5 | 60 |
290 |
| 6 | 70 |
290 |
| 7 | 80 |
290 |
| 8 | 90 |
290 |
| 9 | 100 |
290 |
| 10 |
100 |
280 |
| 11 |
100 |
270 |
| 12 |
100 |
260 |
| 13 |
100 |
250 |
| 14 |
100 |
240 |
| 15 |
100 |
230 |
| 16 | 110 |
230 |
| 17 | 120 |
230 |
| 18 | 130 |
230 |
| 19 | 140 |
230 |
| 20 | 150 |
230 |
| 21 | 160 |
230 |
| 22 | 170 |
230 |
| 23 | 180 |
230 |
| 24 | 190 |
230 |
| 25 | 200 |
230 |
| 26 | 200 | 220 |
| 27 | 200 | 210 |
| 28 | 200 | 200 |