Castle Idler
Offers
Trailers & screenshots
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About Castle Idler
Castle Idler is a short, relaxing incremental tower defense game with no waves. You deploy towers along winding paths, upgrade them, collect coins and defend your castle against increasingly difficult levels with tougher enemies and trickier paths. Prestige upgrades strengthen your defenses exponentially.
Frequently asked questions
The best price for Castle Idler is $1.88 at Eneba. That is 52% less than on Steam, where it costs $3.99. 7 shops have an offer that activates in your country.
Some are. This page only shows offers that activate in your country; offers for other regions, or with no stated region, are left out. To see the offers for another country, change your country at the top of the page.
Every key we list activates on Steam. Redeem the key there and Castle Idler stays in your library for good.
Yes, with a small risk. Publishers create keys to sell in other shops, which is why a key can cost less than in the official store, and once you activate it the game is yours to keep, just like a store purchase. On average 1–2% of keys fail, so check the shop's buyer protection before you buy: the official store does not refund keys bought elsewhere.
The minimum requirements for Castle Idler are: Windows 10, 4 GB RAM, 200 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.
No. Castle Idler is a single-player game.
Mostly, yes. Valve rates Castle Idler as Playable on the Steam Deck: it runs, but may need some manual setup.
Buy Castle Idler 52% cheaper than on Steam.
Castle Idler is available for 52% less in shops such as Eneba, Difmark, or Kinguin.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.











