It's rare I finish a game (in general), but I did see the ending sequences of Colours and Generations. Playing (gradually) through Lost World, keep hitting walls of difficulty. Skipping the fiasco that is Boom entirely (first time I'll have done so for a Sonic title since Black Knight). Hell, I think the only Sonic title other than Colours & Generations that I've completed since S3&K is Sonic Rush (which I 100%'d, which is even rarer!). Tend to buy, play, then hit a wall and move on (or just drift off it due to the system being inaccessable, this is what happened for Unleashed. That and loathing Werehog levels).