Any mod recommendations for a 5 year old? He's got a laptop with Debian on it and I'd like to set him up with MineTest, but I'm not sure he can handle the full MineClonia experience.
There are plenty. I would look at Minetest Education along with some of the games.
You also could look at the KDE kid games app
Can it do splitscreen natively without requiring things a 5 year old couldn't do?
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