|Upgraded a troop, projectile, spell or bonus room to its maximum level.|
This achievement just takes a little time and gold. Play through the game a fair bit and don’t worry about this achievement too much. As you progress you will be upgrading things, and eventually you should have enough gold to upgrade something to the maximum level (LV10). Personally, I suggest the Tri-Stone projectile, the Pantry room or the Treasury room, as these will give you the best edge in battle.
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