I'll never get when games have that one incredibly difficult level in the middle of the game. Level 3-5 probably took me close to two hours to solve. The last level probably took me 10-15 minutes and I don't think another level took me more than 10 minutes...
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Whenever someone mentions that it makes me think of StarTropics for the NES. It took me two years to beat Chapter 3 and two days to beat the remaining four chapters. Forget the Turbo Tunnel, the Ghost Tunnel is the true definition of "Nintendo hard".