LOL I can never get the thing past round 5 (if I'm lucky!!).. What I've found is that different tamas are good at different games, or at least the condition of your tama affects how well it performs. EG: light adult tamas do really well at jump but are pretty shocking at bump quite often where as tama with huge smiles win more easily in slot..
This might be different for everyone else but this is what works for me
Yeah actually I find some tamas better at playing bump than others despite their weight! It also depends on the age of your tama as well. Adults have to be heavier to win in bump.