Like "LittleBigPlanet" before it, "Dreams" is only a "game" insofar as it comes with a set of example games created from its tools.
For instance: In "LittleBigPlanet," the previous game series from Media Molecule, you could buy it and play through a "campaign" of levels/worlds. But the real point of buying "LittleBigPlanet" was to create your own levels and play the creations of the game's community.
Such is the case with "Dreams." It has a "campaign" of levels created by Media Molecule, but they exist as a demonstration of the game's creation tools.
Also like "LittleBigPlanet," an online depository of creations — freely playable by anyone — is a big part of the experience.
To that end, "Dreams" is three components:
1. A main campaign
2. A robust "creation" mode
3. A community-driven selection of player-created content.
It's the latter two components of the three that people got to explore in a recent beta for "Dreams," and the results are remarkable.