Ironhold - Idle Tower Defense v1.0.31

You command one castle in the world of Thornveil, and the waves never stop. That's Ironhold: place your defenders, route your gold across attack, defense, and support, then watch the siege play out. When the keep finally falls, the coffers fill and your next run starts stronger.

The roster is the hook. Fifty-five named heroes from eleven Houses level up, carry their wounds, and bring your history across runs — and captured defenders can be sent home in rescue missions. Twenty-eight artifacts bend the siege in new directions, and the weekly Veilwatch throws fresh invasion scenarios and leaderboards at you.

This is for strategy players who like idle pacing. The keep earns resources and pushes waves while you're offline, and no timers stand between you and your next decision. Deep without demanding your whole day.

Free to download at 75 MB, rated Everyone. Optional rewarded ads and in-app purchases are included, and the developer says both are entirely skippable. It launched in September 2026 and has been climbing the new-strategy charts.