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No installer needed? Just copy the files somewehre? That would be nice.

Sure. Plenty of Java-based games do this.

This may come off a bit snarky but is there really plenty of Java games out there? If so, anything anybody might have heard off?

Minecraft was somewhat popular a few years ago. :P

Runescape also used to be a pretty big one, even if it's been shrinking lately AFAIK.

Minecraft would be one that a few people have heard of...

Many games on Android are also Java based obviously.