Same with the Santa Rockstar engine. The sync between music and the notes are like the worst there is (In SR franchise there wasn't anything like that). But one bad thing both SR and RD has (which makes the gameplay give you the same pain as burning in hell) is even if you press it the right time, you miss the notes. Which is really frustrating. Can be avoided like 50% when you get used to it (Since you understand the mechanics a bit) but still that 50% just rises back to 100% in some of the songs that includes pressing one note rapidly in some parts of the song. But everything except these make the game so good that even with these bad stuff I mentioned above, the game is still so awesome. 4 stars for that.
the engine might be bad for the game but dood this is pure childhood and is a good game still! I was playing the first 2 games then these came out like omfg. Yes the next button doesn't always work but I restart the page ._.