Crystal Keeper

Defend a central crystal while moving a hero, collecting gold and building towers. Matching towers can merge into stronger versions, and level-ups offer a choice of upgrades. Monsters arrive in waves, with recurring bosses and repairs performed near damaged structures. Defense combines direct hero movement with tower placement and merging. The hero has a separate spell, while construction, repairs, and upgrade choices compete for attention between waves.

Defend the central crystal, collect gold, and build towers in glowing slots. Merge identical towers, select upgrades, repair nearby damaged structures, and survive the waves and bosses.

WASD/arrows or left-side touch drag: move. Click/tap a slot to build; 1–6 select a tower. Select matching towers to merge; U upgrades. E: spell. X: sell. Space: early wave. P: pause. M: mute.

Match tower types before merging. Calling a wave early adds pressure, so finish urgent building or repairs before using that control.

Hero-and-tower defense Matching-tower merges Gold-funded construction Level-up upgrade choices Boss waves and proximity repairs Local browser saves