Goal: every floor hides a golden key. Grab it, open the locked door and walk onto the stairs. Every 5th floor is a boss, then you rest at a camp and pick a blessing.

Controller: L-stick or D-pad to walk, hold ✕ to attack (it aims at the nearest monster), □ or R1 for your ability, ○ to roll, △ for a potion, START to pause.

Phone: drag on the left to walk. Hold ATTACK (it aims at the nearest monster), tap the purple button for your ability, ROLL to dodge and the red button for a potion.

Keyboard and mouse: WASD to walk, hold the left mouse button to attack where you point, Q or right click for your ability, Space to roll, F for a potion, T to wave, Esc to pause.

Heroes: the Knight swings a sword and Shield Bashes, the Archer shoots fast and fires a Volley, the Mage casts splashing bolts and a freezing Frost Nova. More powers are in the Shop.

Watch out: red shapes on the floor show where an attack will land. Spikes pop up after they rattle. Rolling makes you safe for a moment.

Loot: chests and strong monsters drop gear. Better gear is worn at once; worse gear turns into gold. Gold becomes coins for the Shop when your run ends.

New lands: after the Lava Deep come the Poison Swamp, the Haunted Castle, the Sky Temple and the Shadow Throne. Beat the Shadow King on floor 40 to win (and unlock Hard mode). Endless never stops. Press M (or tap the mini map) for the big map.

Gear: weapons, armour, rings and amulets. Wear a weapon, armour and amulet of one set for a bonus. Spare gear goes in your bag: forge 3 into a better one and enchant your weapon at the camp. Shopkeepers sell potions, elixirs and gear for gold. Cracked walls hide secret rooms, and some chests bite!

Online: up to 4 heroes on one floor, or the Arena where heroes fight each other (first to 3 rounds). If a friend falls, stand next to them to help them up. Everyone must stand on the stairs to go down.