Linkye
IronBastion
Tiny invaders. One mighty cat fortress.
Build and upgrade your defenses to protect a moonlit cat fortress from waves of adorable invaders. IronBastion is an endless tower defense game you can play in your browser without signing in.
- No sign-in required
- Play in your browser
- Internet connection required
- Play in landscape
Build, upgrade, defend.
Build your defenses
Choose from four tower types and place them on unlocked building sites. Find the setup that works for your battlefield.
Turn rewards into power
Spend the rewards from defeated invaders to upgrade your towers. Strengthen your favorite defenses as the waves grow.
Hold out for one more wave
Protect the fortress from the incoming crowds and challenge yourself to reach a higher wave.
Getting through your first 10 waves
Check the routes and tower range
Select an unlocked building site and place a tower. Compare enemy routes with tower range, and look for positions where several towers can attack the same enemy. When ready, start the assault. Use the funds earned by defeating enemies to upgrade your towers.
Confirm your defense chip choice
Choose defense chips from regular rewards every 3 waves and boss rewards every 10 waves. Select a card, then confirm your choice to apply its effect. When rewards overlap, such as at Wave 30, complete every choice shown. Progress pauses while you choose.
Review your placement after 10 waves
After clearing Wave 10, 20, 30 and so on and choosing your rewards, the game pauses at the save screen. Saving alone does not restart combat. Continue to generate the next section's terrain. Adjust your placement, then start the assault for the next wave.
Defend the cat castle and defeat every enemy in Wave 100 to reach the all-clear milestone. You can then continue in endless play to reach higher waves and improve your score. Enemies that reach the castle reduce its HP; the game ends when HP reaches 0.
Choosing how to save and resume
- Autosave: continue your previous game
- The game saves locally when each wave is cleared. The title screen's “Continue previous game” resumes this autosave. It does not save an arbitrary moment during combat.
- Manual save: keep a 10-wave checkpoint
- Choose the save action on the save screen every 10 waves to keep a record separate from autosave. Use “Continue save” on the title screen to load it. A manual save from Wave 10 resumes before Wave 11 starts.
- Save file: back up or move between devices
- The save-and-export action attempts both a local manual save and an .ibsav file export. Use “Load save” on the title screen to select and load the file. If your browser uses a normal download, also check that the file appears in your downloads.
Browser saves do not sync to an account. Use a save file when moving to another device or browser. Clearing site data can remove local records, so keep important progress backed up as a file.
If saving or resuming fails
Read the save result message. Local saving and file export can succeed independently. If saving fails, keep the save screen open while securing your progress with an available method. If a conflict with another tab appears, check which tab holds the progress you want before acting. Do not clear site data to attempt recovery. If you cannot resume, check the title screen's save status and backup guidance, or load an .ibsav file you previously kept.
Give your fortress a home-screen icon.
Install IronBastion for quick access from your device. Your app icon opens this game directly.
IronBastion is ready to open as an app.
The install prompt could not open. You can use your browser menu or try again later.
Install from your browser menu
In Chrome or Edge, look for the install option in the browser menu. On iPhone or iPad, open Share and choose Add to Home Screen. Menu names and availability depend on your browser.