Pokémon Mystery Dungeon: Blue Rescue Team Tips

Uncovering maps in dungeons which allow Leader swapping; the Smart way
1: Bring as many team-mates as possible.

2: Set all their tactics to "Go the other way".

3: Split up!

4: As your team-mates disperse throughout the dungeon floor, open up the "moves" page or "team" page and scroll through all your members' names, then cancel the page and resume your exploration.

5: Now you would've uncovered patches of rooms/corridors on the map, and if you also discovered items or the stairway, take control of a team-mate closest to your target by turning it into the Leader, and move towards the target.