It comes down to belief really. Most people just grab a box from the toy store and start using it. In this instant nothing will happen [well, anything that does is done by the person not a spirit] if you use it as a tool [say you make it, charge it with energy and bless it] then it can be used to contact spirits and used improperly you could get in trouble. However, I've used Ouija Boards many times and I know many people who use them, and nothing bad has every happened like in the movies. Nothing flew across the room, no one got possess, or anything like that. The only bad thing that ever happened was my one friend argued with a spirit and the spirit 'haunted' her until she apologized. [But it was stuff like the spirit knocking on her headboard and hiding her homework. Nothing Hollywood would want]
Granted there is a lot of science behind Ouija Boards being illusions of your mind and muscle twitches, so again it all comes down to personal belief. If they scare you then avoid them, if you think they're real, use them like any other tool. Regarding other games, again, it's belief. Most people use it as a game, but if you focus and use it as a tool to communicate, then it can potentially contact a spirit. But again, it's all belief based. Personally I believe in spirits and have spoken with them through the Ouija Board [as well as through other methods and I have sensed/seen them] so for me it's a tool. Others might feel differently. I suggest you research Ouija Boards and draw your own conclusions. Good luck to you.