Classic game. Alongside this you will also receive the master levels, evilution and plutonia experiment. The original game still holds up, but the dlc's are a pain: mostly weird puzzles and encountered too many bugs. But if the original game is what you're interested in, go for it, it's a really great experience. Another nice fact about the game is that difficulties don't only change the damage you receive but also the number, placing and type of enemies, really nicely done

7,5/10

Even though it's not available on the Steam Store anymore, this version is the true original experience.