Merlon Merge Defense

The keep of Merlon has fifteen plinths in its courtyard and one road around them. Clockwork raiders come up that road from six lands, each with a boss of its own, and the towers you raise on the plinths are all that stands between them and the gate.

Merge tower defense: summon towers onto 15 plinths, drag twins together to level them up and line them up so one merge cascades. 30 stages, 6 bosses.

Raiders walk a road up the left side of the courtyard, across the top and down to your gate; towers fire at them on their own. Press Summon to put a random tower from the stage's deck on a free plinth; each summon costs 5 mana more than the last. Drag a tower onto a twin, the same kind at the same level, and they merge into one tower a level higher, up to level 7. If the merged tower then stands next to another twin of its new level, that one folds in too and fires a surge that hits every raider on the road, and the chain goes on as long as it finds a twin. Drag a tower onto a free plinth to move it there. The cards under the field temper a kind: every tower of it hits 30% harder, four times. Raiders pay mana when they fall and mana trickles in while waves run. A raider that reaches the gate costs a heart, a boss costs all three; win a stage by holding through ten waves and its boss.