The basics.
How Tower Swap actually works — the swap mechanic, the day/night cycle, the resource → defense pipeline, and the controls. Start here if you have not played yet.
What Tower Swap is
Tower Swap is a genre hybrid — part match-3 puzzle, part tower defense. You defend a castle from waves of dragons by matching three identical resources on a grid, which transforms them into weapons or walls. The game runs free in the browser on CrazyGames and as a standalone app at towerswap.app, developed by Curtastic Corp.
Unlike most match-3 games, Tower Swap lets you swap any two adjacent tiles — you do not have to form a match on the swap. This is a fundamental feature, not a bug: many of the strategic decisions in the game are about moving resources into position rather than instantly matching them.
The day & night cycle
Every day in Tower Swap is split into two phases:
- Planning phase — you have a limited number of swaps to make matches, build defenses, and rearrange the board. Once you run out of swaps, the day ends.
- Attack phase — dragons spawn and move toward the castle. Your placed defenses fire automatically. You watch and hope; you cannot move anything during this phase.
The day count matters: day 10 and day 20 are the first boss-dragon levels, and the game shows an arrow before the round indicating where the boss will appear per CrazyGames. See Bosses for what to do about that.
From raw resources to defenses
Five raw resources appear on the board: stone, wood (logs), gunpowder, ice, and gold. Match three identical resources in a connected line, and they transform into a tier-1 defense (or, in the case of gold, into a treasure chest). The pairings are fixed:
- 3× Stone → Arrow Tower
- 3× Wood (Logs) → Ballista
- 3× Gunpowder → Cannon
- 3× Ice → Ice Wall
- 3× Gold → Treasure Chest (gives extra swaps + sometimes special items)
Full detail and the upgrade ladder is on the Resources page.
Merging defenses
Once a defense is on the board, you can merge it: when three identical defenses sit beside each other, they combine into a higher-tier version (basic → bronze → silver → gold). Merging trades coverage for power. One gold-tier cannon hits harder than three basic cannons, but covers less of the map. Knowing when to merge and when to spread is a core skill per CrazyGames listing notes.
Controls
Tower Swap was built mobile-first, so the controls are minimal:
- Click and drag — pick up a tile and drag it onto an adjacent tile to swap them. This is the only action verb in the planning phase.
- Pause button — upper left of the screen. Opens the pause menu, where you can get free gold (once an hour), undo recent swaps, and access settings.
- Undo — works for swaps that did not trigger new resources to drop into the board. Once new resources have appeared, that move is locked in (prevents save-scumming) per Johnny’s Classics.
On desktop, click-and-drag works the same way as tap-and-drag on mobile. There are no keyboard shortcuts.
Account & offline play
You can play Tower Swap without signing up. Creating an account unlocks: custom avatars, joining clans, leaderboards, weekly war battles, and chest rewards. The game saves progress per-device for guest play, but persistent multi-device progress requires an account.
The mobile app is fully playable offline; only the social/competitive features need an internet connection.