Easy encounter on the fly. Throw X monsters with level equal to the party level.Another question about 4E: does it support sandboxy games. As in, is it easy to throw together encounters on the fly and does it support PCs sometimes engaging with challenges that don't line up with APL?
Otherwise the math of 4ed was unforgiving. roughly a monster 5 level higher mean that player need 15 to hit him, while thismonster need a 5 to hit the PC. So encounter were forced to have monsters that roughly match PCs level.