Towerdef.io is a free, no-download, no-signup browser tower defense game with a retro terminal/CRT theme. Enemies march along a fixed serpentine path; your job is to place and upgrade towers along the way so none of them reach the end.
Drag a tower from the Tower Depot on the left onto an open grid cell to place it. Each tower has a gold cost, a range, a fire rate, and (for some) splash damage.
Press [ START WAVE ] to spawn enemies. They enter at the green arrow
and walk toward the orange square at the end of the path — each one that
reaches it costs you a life. Run out of lives and the game ends.
Click a placed tower to open its upgrade panel. You can independently level up its damage, fire rate, and range, or sell it back for gold if you need to change strategy.
Killing enemies and completing waves earns gold. Waves get progressively harder — more enemies, more hit points, faster enemies — and boss waves appear periodically with much tougher enemies. Balance offense (damage towers) with economy (gold-generating towers) to keep pace.
Long-term goals like wave milestones, kill counts, and economy targets unlock
achievements you can review from the [ ACHIEVEMENTS ] menu in-game.
Your progress autosaves to your browser's local storage, so you can close the tab and resume later — no account required.
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