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 |