I've been playing games for over 20 years and these four Sonic games are as hard as nails and I highly recommend that you save your game after you have completed each level. I have Sonic Rush Adventure which is alot easier to play then these four classic games and I also find the boss battles are pretty tough too. I found the speed of the Sonic games to run at a decent speed and not that much slower then the old Mega Drive versions. The graphics have aged well and the music is very catchy too. These Sonic games are well thought out platform games with great hidden items/routes and are not just about speed. I find the Mario games easier and are overall more fun to play but, I have been playing the Mario games since the NES days. It's great to have these four classic Sonic games because I never owned a Mega Drive and only played them a little bit on a friends console before. Overall this package is excellent value for money if you think your gaming skills are up to the hard but mostly enjoyable challenge.