What is a term for a videogame that, while labeled "Free to Play", is impossible (or extremely slow/tedious) to progress in without spending money on in-game content?
Edit: Freemium is a decent answer, but I'm looking for something with more of a negative connotation.
To further elaborate, an example of the type of game I'm thinking of might be an MMORPG that, without purchasing a special stat boosting potion for real world money, requires an excessive/unrealistic amount of grinding/leveling in order to progress through the game.