[tromp]

But you can safely say "Ladders are PSPACE-complete" about the game of Go which is played on many different sizes, some far larger than the standard 19x19 (e.g. KGS supports 38x38 boards).

[w0bb13]

The number of serious games above 19x19 is basically nil, so the difference is a bit misleading (although it's definitely more common in go).