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Does anyone happen to know what board the parent set is from? Something is suggesting that either this board is very rare or the set currently in MAME is a bootleg too.

Either way, there's supposed to be a bug in that set that reboots the game if a single life is played too long (about 2 or 3 courses); that was a while ago, so is that still in MAME (was it a MAME bug of some sort)?

As far as what I've seen out in arcades, I've only seen the Irem boardset and the Williams boardset. It could be my imagination but I always thought the Williams set played slightly tougher with more aggressive enemies.