Endless is the test after the bosses. Waves ramp past a normal board.
What it asks
Endless keeps sending waves that grow. A board that cleared the bosses meets waves it was not built for. The run ends when one lane breaks.
The cap
The board caps when every lane is merged and the next wave still breaks one. Past that, only a better synergy or a luckier shop stretches it. Plan for the cap.
Scale the pair
Deepen the core pair, not a hero unit. A board that scales melee plus ranged plus support lasts longer than one big bonker the wave walks around.
The calls
Spend gold on the lane the wave exposes, not on the unit you like. Endless rewards the board that adapts, not the board that peaked early.
The progression guide covers what carries between runs, so the next endless starts stronger.
Endless scales differently
In endless, waves keep climbing past the normal cap, so your board must keep merging, not just hold. Prioritize economy bonkers early so income outpaces the curve, and keep one merge slot open for the pair the shop offers. The spikes get tighter, so pre-building each lane before the marked wave matters more than in a normal run.
Carry your unlocks in
Meta progression (unlocked bonkers, starting gold) carries between runs, so spend progression currency on the board the best builds guide describes. The next endless starts stronger only if your unlocks serve that board, not a random one. The progression guide covers exactly what to bank.