don't know about halalness.. but see games are a problem I've too.. but I stoped all kind of violent games.. only keep it to FIFA to be safe... n even then that's wrong coz of tym waste(laghv)... so I devised this compromise that I mute the vol n listen to something good whn playin.. :D coz these things take away frm our purpose of lyf..
www.youtube.com/watch?v=QlXH0QidvbI
www.youtube.com/watch?v=hUm5SlRQYwg
www.youtube.com/watch?v=QlXH0QidvbI
www.youtube.com/watch?v=hUm5SlRQYwg
Sorry to pop in, but you know what, psychologically speaking, these things do affect us....I mean, with time, we do get used to such stuff, and I believe they affect our behaviour n personality.
I have no reasons to support, and am speaking based on some personal experience. badrobot14 will definitely be able to give you an answer supporting it with references, inshaAllah.