Taiga - If a piece is moved here, you must wait two turns until you can move it again (Has to move on the third turn). However, it cannot be captured while it is here unless it is captured for checkmate or check. If your piece has not moved yet and starts on this square, the "freeze" rule does not apply. This also means that if you deliver checkmate by moving here, it does not apply until your piece thaws out. Flats - If your king is not on this square and the game does not end in a resignation, you immediately lose - even if YOU delivered checkmate. However, if neither kind is on the "Flats" then this rule does not apply. Desert - If a piece is moved here and doesn't move again for 3 turns, it sinks into the ground and disappears . (Sorry White, no d4 or e4!) However, if your piece is already here at the start of the game, this rule does not apply until that piece has been moved. Plains - Nothing special.
I thought of this while sleep-deprived and caffeinated at the same time.