Actually, SNES9x and ZSNES are both pretty buggy, and include hacks to make individual games run correctly. Allegedly ZSNES 2.0 is under development with improv

Actually, SNES9x and ZSNES are both pretty buggy, and include hacks to make individual games run correctly. Allegedly ZSNES 2.0 is under development with improved accuracy, but who knows if or when it'll ever be released. The true SNES reference software is bsnes, with no per-game hacks and only three known-incompatible games (and then only because they use obscure co-processors that nobody can find any references for): http://byuu.org/bsnes/ Be warned, though - bsnes is a sub-cycle-accurate emulator of a reasonably-powerful hardware platform, and so has surprisingly steep hardware requirements (any desktop processors released in the past couple of years should be fine, but people who still haven't upgraded their Pentium 4s are likely to be in for a bit of a shock).