Best free-to-play games for AI and tech fans

Published 14 October 2026. All games listed were free to play at the time of writing; optional in-game purchases may apply.

If you spend your days with AI tools, code or hardware, you'll probably enjoy games that reward systems thinking: optimising, automating and figuring out how things work. These are our picks that cost nothing to start, split into games where you actually write code and well-known free games with plenty of depth for tinkerers.

Games where you write real code

Bitburner (Steam, free)

An incremental hacking game where you progress by writing JavaScript scripts that automate in-game "servers". It starts simply and ramps up to genuine programming problems: scheduling, resource optimisation and algorithms. It's open source and free on Steam, and it's one of the best ways to practise scripting while feeling like you're playing a game. Fun to pair with an AI coding assistant, if you want to see how well it handles an unfamiliar API.

CodinGame (browser, free)

CodinGame turns programming puzzles into small games and runs regular bot-programming contests in which your AI competes against other players' code. It supports dozens of languages. The multiplayer bot arenas are a great introduction to game-playing AI techniques such as search and heuristics.

Elevator Saga (browser, free)

A small open-source browser game where you write the JavaScript that controls a bank of lifts. Each level adds more passengers and tougher targets. It's a neat lesson in why scheduling is hard.

Robocode (free, open source)

A long-running programming game where you code a battle tank in Java or .NET and pit it against others. It has been used for years to teach programming and simple AI behaviour.

Free games with plenty of depth for tinkerers

Path of Exile (free, PC)

An action RPG with a huge passive skill tree and crafting system. Theory-crafting builds is half the game, and the community makes spreadsheets, planners and tools to help. Free to play, supported by cosmetics and optional storage tabs.

Warframe (free, PC and consoles)

A co-op sci-fi shooter with deep build customisation and a large player-run economy. Everything that affects gameplay can be earned by playing, though grinding is part of the deal.

Dota 2 and Counter-Strike 2 (free, Steam)

Valve's two biggest competitive games are both free. Dota 2 is also part of AI history: OpenAI's "OpenAI Five" bots beat the reigning world champion team, OG, in April 2019, a landmark for reinforcement learning. Playing it gives you a feel for how complex that challenge was.

Rocket League (free, Epic Games Store)

Rocket-powered car football with a high skill ceiling that rewards physics intuition. There's an active community building bots for it, too, through the RLBot framework.

A word on free-to-play spending

Free-to-play games make money from optional purchases: cosmetics, battle passes and in-game currency. Set a budget and use the parental controls or spending limits on Steam, Epic or Xbox if anyone younger plays on your account. Under UK advertising rules, games must clearly show when something costs real money. If something looks misleading, you can report it to the ASA.

Want paid games without paying full price? Check what's free on Epic right now and this week's best PC deals.