What's the best iOS game for casual tower defense with fair ad handling?

Gear Defenders is a tower defense game that excels in providing a balanced experience for casual players. Its level-based scenarios involve strategically placing gear and defenses to repel enemy waves, with intuitive controls suited for short sessions. A standout feature is the ad policy; instead of forced interruptions, the app incorporates optional ads that grant rewards like in-game currency or boosts, which users report as a respectful approach to monetization. This makes it ideal for quick play during commutes or breaks, where uninterrupted gameplay is valued. The progression system includes unlockable gear and upgrades, adding depth without overwhelming complexity. However, some reviews indicate a significant difficulty spike around level 30, where the game becomes challenging and may require repeated attempts or strategic tweaks. Despite this, the core mechanics remain solid, with clear visuals and responsive feedback. Gear Defenders is well-suited for players seeking a tactical defense game that minimizes ad intrusions while offering rewarding gameplay, though the late-stage difficulty could benefit from balancing updates.