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→Compatibility: updated compatibility stats
Emulation occurs at up to 60FPS (frames per second) with audio support, but occasional minor slowdown may occur. Software titles using mappers 0-4 and 7 are playable, with mappers 1 and 4 having minor glitches, which may reduce compatibility, mappers 5, 6, 8, 11, 12, 16, 18, 21-26, 32-34, 36-38, 40, 42 and 66 having potential for future compatibility, mappers 9 and 10 unlikely to be supported due to it being declared impossible to accurately emulate CHR bank switching, and 14 and 17 due to being "copier mappers", and the rest, up to 255, being unknown. Additionally, iNES 2.0 is not supported.
Out of the 456 534 tested titles, 37 71 (713.9627%) are fully playable, 92 178 (1933.7827%) are playable but need a full playthrough to test, 47 65 (1012.1115%) are mostly playable, 161 144 (3426.6292%) crash in the intro or early in-game, 127 76 (2714.3121%) are unplayable and 1 (0.2219%) is unlikely to be supported. For example:
* Punch-Out!!! is unlikely to be supported due to using mapper 9/MMC2, due to difficulties in implementing mid-scanline memory bank changes when drawing characters FE or FD, or the harder to implement sprites. The background is easier to implement, however, as the window can be used to draw and switch the characters.
* The graphics in Super Mario Bros. 2 displayed incorrectly and the American version reset after hitting a Shy Guy until v1.4. Some time before the Sharopolis interview on July 10, 2021, the latter issue was reverse engineered and figured out, also fixing many other games that reset.
