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Original Phone-friendlyAdded 2 hours ago

Idle Defense: Cosmic TD

Idle space tower defense: your station fires on its own, you pick the upgrades and push through boss sectors.

Playon ruicodex.com (opens in a new tab)

Opens the creator's site in a new tab. Foundplay doesn't host games. Link checked working 2 hours ago. How we check links.

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From the creator

Idle Defense: Cosmic TD is an idle space tower defense game. Your battle station fires on its own, wave after wave. You spend the cash enemies drop on attack, defense and utility upgrades, and tap enemies for bonus damage.

Every 25 waves is a new sector with its own boss, and every 10th wave brings a boss fight. Specialize your core as a Laser, Sniper, Frost or Tesla tower, unlock research, equip modules, collect relics and Ascend for Crystals that make every future run stronger. Daily missions, a Daily Supply Drop and an Enemy Codex give you a goal every session.

It plays in the browser on desktop and on phones (portrait), and your progress is saved in your browser. Ads and in-app purchases do not run in the browser version.

Also free on Android: https://play.google.com/store/apps/details?id=com.ruicodex.idledefense&referrer=utm_source%3Dfoundplay%26utm_medium%3Ddirectory%26utm_campaign%3Dpromo_2026_10

Made by Rui Codex with TypeScript, React and HTML5 Canvas.

At a glance

Idle Defense: Cosmic TD is a free strategy game that plays in your browser on idle.ruicodex.com, with touch controls for phones. On Foundplay since October 18, 2026, with 1 play.

Platforms

Computer, phone

Released

On Foundplay October 18, 2026

Questions

Is Idle Defense: Cosmic TD free to play?
Yes. Idle Defense: Cosmic TD is free and plays in your browser on idle.ruicodex.com. Foundplay links to it but doesn't host it.
Do I need to download Idle Defense: Cosmic TD?
No. It runs in a browser tab, with nothing to install.
Is Idle Defense: Cosmic TD safe?
Foundplay checks its link every few hours and gives it a daily safety check (malware blocklists, downloads, crypto miners, parked domains and fake virus warnings), and hides the game at once if that check fails. No check can promise a site is safe: if a game asks you to download something or for a password, leave it.
Can I play Idle Defense: Cosmic TD on my phone?
Yes. It has touch controls and plays in your phone's browser, with no app.
What games are like Idle Defense: Cosmic TD?
Ant Royale, Clickipedia and Rule and Ruin, from More like this below. They're free in your browser too.

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