Why not let the corpses "rot away" after 2 or 3 minutes? Agreed regarding
invisibility, but you must already have a high level character for this
approach. Now youv'e also a problem if you leave the level for a while (teleport
home to upgrade stuff for example), and return finding all bots having
respawned. Could it happen, by the way, that the number of obstacles can be
exceeded also by living bots, or do only dead objects count?