If you enjoy physics based gameplay like I do, the 2D originals are a great ball of fun. Sonic Adventure 1 and 2 are also tons of fun for the same reason although both games have annoying camera issues in some places. Sonic Mania is a much newer 2D game based on the originals and was great too. The newer 3D games are very hit and miss. They play like a glorified Temple Run game where you just mash a button and race through everything without having to think which can get tedious fast