Gdevelop is a no-code, open source, free tool to create 2D computer games, such as platformers or rogue-like or isometric style games.
You can create and edit games online, or download an app to do so. To create your game you don't code, instead you create a number of events and actions in a point and click manner.
There are lots of great graphics and backgrounds you can use for free built into the tool's Asset Store. There are also useful free libraries you can add to your projects like a Physics engine for example, so you can easily create your own Angry Birds or similar.
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