(1) Four-in-a-row (Basically connect 4)
Love the fact that you're bringing out skill-based games, we definitely need more of these as far as I'm concerned.
However, I think this four-in-a-row game is just asking to get botted. There are AI tools available online that will automatically solve for the best possible combination given the current state of the board.
I really think you're going to need to make games that people absolutely cannot cheat on, otherwise the losers will not be happy.
Totally agree that if this gains popularity bots would become a problem. Less so if you're just challenging a friend but definitely a fear when playing strangers. 100% connect 4 there are solvers for, I was thinking it was a nice place to start as a proof of concept.
You're right that more advanced games would be more challenging for a bot trying to decide what makes the most sense to add next. Working on that next and some other deterrents and detection mechanisms.
Would love to have you try it out and if you have any game ideas you'd like to see lmk!