Screenshots
Watch trailer on Steam ↗castle idler
Soy Boy Games · Published by Soy Boy Games
Mostly Positive — 80% positive (183 reviews) · 28 achievements
Last updated 28 Sept 2026
castle idler is a short, relaxing incremental tower defense game with no waves. upgrade towers, collect coins, and unlock powerful prestige upgrades to defend your castle.
£3.49
Lowest price we've ever recorded
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Price history
Strategy, Casual · 2026 · More under £5 games
Explore a unique tower defense experience where relaxing upgrades and coin collection shape your defensive strategy. Castle Idler challenges you to protect your fortress without traditional waves, offering a fresh take on the genre.
About this game
castle idler is a short, relaxing incremental tower defense game with no waves. upgrade towers, collect coins, and unlock powerful prestige upgrades to defend your castle.
deploy a variety of towers along winding paths and continuously upgrade them.
progress through increasingly difficult levels with trickier paths and tougher enemies.
unlock powerful prestige upgrades that make your defenses exponentially stronger.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10
- Processor: 2.7 GHz Dual Core
- Memory: 4 GB RAM
- Graphics: 512MB, OpenGL 3+
- Storage: 200 MB available space
Recommended
- Requires a 64-bit processor and operating system
Supported Languages
Latest news
Patch NotesOfficial
1.11 - hotfix
fixed a bug causing magic arrow to not check for burn 1000 achievement changed all number displays to display k for 1 thousand and m for 1 millionRead full article on Community Announcements (soyboygames)Patch NotesOfficial
Small Patch to 1.1 version
Prestige nodes that damage all enemies when stars are clicked now synergize with prestige nodes that give money whenever an enemy is hitAdded 3 new free population prestige milestones to the prestige treeRead full article on Community Announcements (soyboygames)Patch NotesOfficial
1.1 - Major Balance Update
Hi everyone. Thank you for all of your feedback and for your patience as we worked on balancing the game.Here is the list of updates for 1.1 version:Added damage indicators when enemies get hit (can be turned off in settings)Added ability to view the tower's DPS over the past 5 seconds by hovering over the towerAdded a free new prestige that prevents attack speed from resetting after prestigingAdded a free new prestige that prevents damage from resetting after prestigingAllow refunding previous prestige row without refunding lower rowsNo longer allow players to get more than the required prestiges in each rowBomb artillery can now target the last enemy in line.Nerfed enemy health valuesBuffed Flame TowersThese updates should make the progression a lot smoother. If you experience a drop in framerate after this update, please let us know in the Steam Discussion Hub or our Discord.If you encounter any other issues or have further feedback, please let us know.Thanks again for your support.Read full article on Community Announcements (soyboygames)Patch NotesOfficial
1.03 update
made cloud save work properly across all platformsfixed a bug causing achievements not unlocking for completing level 20 and 30Read full article on Community Announcements (soyboygames)Patch NotesOfficial
1.025 update (balancing/bug fixes)
1.025 updatenow allow players to continue playing after beating the gamefixed issue with cursor lagbalanced some of the levels to make progression smootheradded a button in prestige tree that refunds the whole treefixed a bug making the speedrun achievement not workThank you to everyone who has played the game and left a review.We received multiple points of feedback regarding the balancing of the game.Over the next few days, we will work on rebalancing the game further and making the progression smoother.Thank you for your patience, we will keep everyone updated on future changes.Read full article on Community Announcements (soyboygames)
