Merge Defense – Medieval Stone Tower Defense Game

About Merge Defense

How to Play Merge Defense

Merge Defense Rules

• A run starts with 60 gold, wave 1 and 20 castle HP.
• There are six fixed tower foundations, and a new level 1 Stone Tower costs 20 gold.
• Stone Tower level 1 upgrades to level 2 for 25 gold, and level 2 upgrades to level 3 for 40 gold when no token is available.
• At level 3, choose Catapult or Trebuchet for 55 gold when no forged token is available. The specialized tower becomes level 4 and can continue to level 6.
• Three core fragments automatically merge into one upgrade token; the next selected tower upgrade or specialization uses a token before gold.
• Every cleared wave pauses for a three-choice run upgrade before the next wave can start.
• Focus Fire never extends normal range; only towers that can reach the marked enemy prioritize it.
• Mud Trap can be activated once per wave and slows active enemies for 2.5 seconds.
• Every enemy reaching the castle removes 1 HP; the run ends when castle HP reaches zero.

Medieval Defense Rewards

Merge Defense Game Mechanics

• A run starts with 60 gold, 20 castle HP and six fixed battlefield foundations. A level 1 Stone Tower costs 20 gold.
• Towers no longer need duplicate copies to level up. Select a tower during PREP and spend gold, or a forged token, to upgrade it directly.
• Stone Towers upgrade through levels 1–3. At level 3, choose Catapult or Trebuchet; the specialization becomes level 4 and can continue upgrading to level 6.
• Some kills drop core fragments. Three fragments automatically merge into one token that pays for one tower upgrade or specialization instead of gold.
• After every cleared wave, choose one of three run upgrades such as more tower damage, faster attacks, longer range, wider splash, extra castle HP or bonus gold.
• During battle, tapping an enemy marks it for Focus Fire for about three seconds when towers can reach it. Mud Trap can be used once per wave to slow all active enemies for 2.5 seconds.
• Enemies always enter from the right and move toward the castle on the left. Waves use Raider, Scout and Knight mixes, with Ogre Chief bosses every fifth wave.
• Best wave and cumulative kills are stored in localStorage. Towers, run upgrades, forged cores, gold, HP and current wave reset on a new run.

Tips & Strategies

• Because there are only six tower positions, upgrade well-placed towers instead of filling the battlefield with low-level duplicates.
• Use Catapult for clustered enemies and Trebuchet for slower, heavier long-range hits, especially against armored Knights and Ogre Chiefs.
• A forged token can replace an expensive late upgrade, so saving tokens for specialization or level 5–6 upgrades can be efficient.
• Choose wave-clear buffs that match your current tower mix instead of taking the same stat every time.

Game Info

Frequently Asked Questions

Continue with games built around the same merge mechanic.

Hex Merge

Play Hex Merge on a 5×5 hex board. Merge equal adjacent tiles, score new level × 2, spawn a new 1–3 tile after each merge, and avoid a locked full board.

Strategy

Pet Merge

Play Pet Merge on a 5×5 board. Combine any two matching pets into a higher tier, earn exponentially larger merge scores, and add new pets to random empty cells.

Idle

2048

Play 2048 online on a 4×4 grid. Slide equal number tiles together, score the value of each merged tile, and get a new 2 or 4 after every valid move.

Puzzle

Fusion 4096

Slide matching tiles together and keep combining values toward the 4096 tile. Play Fusion 4096 free in your browser with clear controls and instant restart.

Puzzle