Maybe an advanced mode where extra seconds are deducted for each wrong pair guessed? And along with that the ability to skip a turn for extra seconds deducted.

Maybe an advanced mode where extra seconds are deducted for each wrong pair guessed? And along with that the ability to skip a turn for extra seconds deducted. That way, since brute force would no longer be an option, you wouldn't find yourself getting hopelessly stuck early on behind a particularly difficult set.