Addicting games... To me this means the following:
- fast fun (just start it and never stop again)
- lots of fun, but little complexity, therefore little frustration
- infinite replay value
All these points apply to a limited choice of games to me:
- Donkey Kong Country 2 (and only this one!) - simply badass
- Streets of Rage 2
- Metal Slug X
All the other games that have been mentioned here might be fun, but honestly, I wouldn't call them truly addictive, simply because they have slow/boring portions, as well.
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