Protect your border from the invasion of stickmen in Merge Tower Defense, and if even one of them crosses the line, the defense will fail. Behind the line you must place guns that will aim and fire automatically. The number of attackers will grow, so the guns need to be upgraded. This is done by merging two identical turrets. The result is a more powerful weapon that no longer fires one projectile, but several at once in Merge Tower Defense. The defense strategy is entirely up to you.
