Preferably free or at least not to expensive (<20 EUR)

Edit: Thank you so much for all your great suggestions! I now have to buy 2 controllers I think? Steam does not say what input hardware is needed for local multiplayer.

  • Multiplexer@discuss.tchncs.deEnglish
    161·
    5 days ago

    Basically all the Lego games (although 13y olds might already find them too child-like, depends…).
    They all have split screen, so are suitable for couch (or desk) coop.
    Also the slightly older ones are quite inexpensive when buying them during sales (a few €).

    Special recommendation: Lego City Undercover.

    Another fun couch-coop-capable game would be SuperTux, a Super-Mario-Cart like game.
    This one is OSS and therefore completely free!