When running my players through Challenge of Chamions VI, I found a few problems (or perhaps I missed a few things...?)
Scenario 1, Snakes and Ladders: what exactly prevents the PCs from levitating to the ceiling and propelling themselves forward using the ceiling? Granted, the walls are too smooth to climb, but this is not "climbing" the ceiling... a very small amount of friction would be sufficient to cross the pit in this way. When the first PC has crossed the pit, he can just take off the boots and throw them back to the other PCs.
Scenario 2, Duck, Duck, Goose: a 5-pound bucket is the absolute maximum of a heavy load for a raven (tiny creature)... and it can still fly with that?
Scenario 3, Egg Toss: The description of "Daern's Instant Fortress" states that anyone "nearby" takes 10d10 damage from its expansion. How are the players to guess that "nearby" doesn't include "right above"? And even if they suspected this, the Instant Fortress grows from (basically) zero size to a height of 30 feet in just 6 seconds, that's a speed of 5 feet per second... a bit much for an egg, wouldn't you agree?
Scenario 4, Tag: Just a minor problem here, the DMG says a Staff of Divination "often" has a forked tip... so the players must think to ask the DM what shape this particular Staff has.
Scenario 6, Horseshoes: The Horseshoes have no command word. So why doesn't the black horse start the scenario already levitating, thus giving away the magical nature of its horseshoes? Or, in other words, what exactly is supposed to trigger the levitation effect?
Scenario 9, Old Maid: A minor oversight in the description... the first paragraph includes the statement "... her hands are tied to two of the thick vertical bars...". The end of Marilyssas introduction however states, "With that, she puts the gag over her mouth...". Oops. I suppose the extra pair of arms drops to the ground right after putting the gag over her mouth. :-)
I suppose a bit more playtesting might be a good idea...? It was still a great adventure, but it could have been better. Particularly the scenarios 2 and 3 were made extremely difficult because of that... well... sloppiness.
Oh, one more thing - anyone interested in a German translation of Challenge VI? I have made a complete translation of all the introductory scenes for the ten scenarios, plus abridged translations of the solutions and notes. I'm willing to put those on my web pages - if someone from the Paizo staff grants the permission to do so... *hint* *hint*