It's not a childish game or for children, they may swallow those pieces or stuck them into their nose or ears like @dreeyor's friend. The real stones look different. This is a cheap German version ..not cheap if it comes to it's price.
Well, if I play it I buy a better one instead of this ugly version.
My friend doesn't necessarily eat stuff; he only does that when he hears it's sweet, has a nice flavor, or he wants to prove his claim: "you won't die". (He swallowed our titration base during chemistry practical; he always says this after "it's diluted, you won't die", though he drinks water afterwards.) It wasn't a strong solution, luckily. In another session, he took a spoon of ethanol we were supposed to use for a practical – everyone teased him; we joked "bro, how many fingers?" He responded right, so we hid one finger saying "the drink's taking effect, go sleep!, don't blow our lab" . I actually love board games, @lupega, and don't think it's childish. Even old people play this 🙃 (I've only seen them play this in movies. I haven't played gobang before, although chess and checkers are quite popular here, and one called "ààyò", which is an old people's betting game. Mainly they use checkers and aayo for betting). Nowadays, things are getting smaller.