Haven't tried Mines since I am hooked on slots, though I tried to play tower and I seldom goes above level 3, lol. It looks like there is an imaginary barrier after level 3 in which whatever I pick is an empty cell. That, or I just suck on guessing games T_T.
You should give it a shot. I'm not big fan of Mines nor slots but I have tried it out since playing on roobet always lots of fun. On roobet I played crash a big time of my entire day! For me Crash is working quite simple, it consists of a continually expanding line going up and multiplying your bet. This things make me insane all of the time. Crash Rocket is love!