so you get map drops for completing a catacombs (do not use a map)
Get a treasure chest at the end for completing a map.
Trap doors and Evil wells do not spawn on maps (unless the map specifically has +x evil wells, even then on rare occasions it can not spawn due to it spawning on the last cell which is overriden by the chest drop)
Worth noting the cap on mob levels per map, if you're doing a patched map at level 55, you're not going to get much exp and it'll be an enormous waste of time
In general avoid levelling past the top level of the map