What are some Self-imposed gaming challenges that you have tried?

[spenderzz]

happydolphin said:

spenderzz said:
I tried forever to do a no-hit run of Mike Tyson's Punch-Out for NES. Closest I came, three different times, was beating the game only getting hit once, always by Mike Tyson in Round 2. What a bastard.

Mike is a bachtardo. No hit means no losing points, or no him touching you at all?

No actually getting punched.  It's impossible to do a full playthrough without blocking.