Pixel Dungeon

The key to getting max exploration score is to go Warlock (for unlimited food) and use whatever means available to collect a bunch of scrolls of foresight (ring of wealth, parchment trinket, recycle spells) as you descend the dungeon. Then after you kill Yog (but before picking up the amulet) go back through the dungeon and use your scrolls of foresight to find everything. This means exploring every secret room and solving every puzzle room (looting the treasures in gas filled rooms, sacrificing enough enemies on the altars of sacrifice to get the weapon, etc).

Leave no treasure chest unlooted, no barricade unburned, no animated statue alive, no grave undisturbed! All keys must be used up, all magical fire walls extinguished. Loot everything!

Then you can go back and grab the amulet for your usual ascension run. The reason the Warlock is so good for this is because he can feed himself just by attacking enemies. He doesn’t rely on drops which are turned off for each enemy when his level gets too high above theirs. Warlock can also take the beacon from the dwarf king’s crown upgrade and use it to teleport around faster, but that’s not really necessary.

You can of course do this on any class if you find a ring of wealth and farm a ton of food and scrolls. Or you can try finding everything on the way down, exploring the intended way (especially with the rogue or a talisman of foresight). But this is more error-prone and especially tricky to pull off if you’re playing 6 challenges including on-diet (because you want to get a high score).