5 stars: It's awesome and fun. There are a lot of adds that appear on my tablet, other then that it's not bad. I think it's fun getting rewards if you log in every day or complete missions. I think it's fun to try beating all the friends to get the most points. It's like a challenge to upgrade your characters because the adds another 400 rings everytime you upgrade a character.
4 stars: The game is quite enjoyable for it serves, but there's some issues. Green Hill music doesn't loop smoothly, Leaderboard doesn't function, many characters have Sonic's Tricks when jumping off springs. Part from that, the game is lively, many characters (even if many don't help much with collecting critters), and locations. The game needs a something \
4 stars: It's fine, I suppose. It gets a bit repetitive after a while, though then again this IS an endless runner so... The ads take up like half the game though, and some of them aren't even skippable which is kinda dumb considering each of them is about 30 seconds at minimum. Long story shory, it's a mobile game, but only partially a game.
4 stars: Still to this day it's the best Casual experience ever! Nuff said! EDIT: Ok, so after a long time playing I can say that it's repetitive, not that is bad, but the first time you play it'll be the last time you'll play it in term of gameplay and what's changed. Oh yeah, and Limited Time Events that while some come back many don't, and that'll hurt the score to me...
4 stars: I'm gonna ...