Remake- Basically a game remade with enhanced audio/graphics, new features and or new controls. Resident Evil PS1 to Resident Evil gamecube If the story changes to much it may be a reboot Reboot- The story is redone and it may have new gameplay to fit the current generation of gamers. Like X-Com or Tomb Raider You should be able to tell if your a fan of the series. Revival- A game that keeps to the current story in the series that may have changed gameplay wise and or may have a upgrade to graphics/audio to fit the current market it has to be dead a long time. Duke Nukem Forever and Donkey Kong being examples Basically a sequel somewhat of a game that hasn't had a sequel in a while. Spinoff- A game that can have a change to the story and or different gameplay. Mario Kart is an example basically something not part of the main series. You should be able to tell if it is or is not part of the main series. Reimagining- A game that has taken a change in direction gameplay wise in a significant way like Metroid to Metroid Prime or Resident Evil to Resident Evil 4 it isn't a reboot since the story has been redone and may be considered a revival. If your RPG starts playing like a shooter or your survival game has turned more into a action game it is a Reimagining in a way. Not all games are just one on this things but most are.