I dunno if this one is too complicated, but I'll throw it out there anyway...
Make a level, one entrance, one exit, must save at least 50%, time limit, release rate and other objects are at your discretion.
This level must give you one of each skill.
There must be at least 8 combinations of exactly two skills that can be used to solve the level. Between these 8 combinations, at least 6 different skills must be used.
For those who find me hard to understand, the level must have a solution for at least 8 of these skillsets:
1 Climber, 1 Floater, 0 of everything else
1 Climber, 1 Bomber, 0 of everything else
1 Climber, 1 Blocker, 0 of everything else
1 Climber, 1 Builder, 0 of everything else
1 Climber, 1 Basher, 0 of everything else
1 Climber, 1 Miner, 0 of everything else
1 Climber, 1 Digger, 0 of everything else
1 Floater, 1 Bomber, 0 of everything else
1 Floater, 1 Blocker, 0 of everything else
1 Floater, 1 Builder, 0 of everything else
1 Floater, 1 Basher, 0 of everything else
1 Floater, 1 Miner, 0 of everything else
1 Floater, 1 Digger, 0 of everything else
1 Bomber, 1 Blocker, 0 of everything else (note: using the blocker solely to time the bomber counts as skill wasting, however, it is acceptable for the blocker to provide another function and then also be the one that gets bombed)
1 Bomber, 1 Builder, 0 of everything else
1 Bomber, 1 Basher, 0 of everything else
1 Bomber, 1 Miner, 0 of everything else
1 Bomber, 1 Digger, 0 of everything else
1 Blocker, 1 Builder, 0 of everything else
1 Blocker, 1 Basher, 0 of everything else
1 Blocker, 1 Miner, 0 of everything else
1 Blocker, 1 Digger, 0 of everything else
1 Builder, 1 Basher, 0 of everything else
1 Builder, 1 Miner, 0 of everything else
1 Builder, 1 Digger, 0 of everything else
1 Basher, 1 Miner, 0 of everything else
1 Basher, 1 Digger, 0 of everything else
1 Miner, 1 Digger, 0 of everything else
Also, your 8 solutions must, combined, use at least 6 different skills. For example, the following set of possibilities would not qualify:
Climber+Floater, Climber+Bomber, Climber+Blocker, Climber+Builder, Floater+Bomber, Floater+Blocker, Floater+Builder
This is because the only skills used are Climbers, Floaters, Bombers, Blockers and Builders, which is only 5 skills. However, if there was one more solution which involved a basher, miner, or digger, it would then qualify.