Digfender

Digfender blends digging with strategic defense. Dig beneath your castle to uncover treasures and relics, then use loot to build towers, set traps, and unleash magic to stop waves of enemies.

With 70+ levels, 5 upgrade trees, a Survival mode, and leaderboards and achievements, it delivers a fair, paywall-free experience with no timers. Critics have praised it as one of the best tower defense games in recent years.