Lock the wallet for only the owner to make transactions.

I would like to know about an idea method in which I can lock my wallet so that only I can make transactions.

I will provide some meta mask wallets for my students and I would like to lock it so that they do not do any kind of negotiation.

It won’t be AXIE, it will be another game;

I need to know how let my players playing in my metamask without doing any transaction.

Someone can reply me