In this puzzle game you have to color each point of the web so that no two points of the same color are connected by a line.
Vertex has three modes:
Practice: freeplay, no time or level limits
Time Attack: compete against the clock and against the world on levels unlocked in campaign mode.
Campaign: attempt to unlock levels by coloring increasingly more difficult webs. Progress is saved and unlocked levels can be attempted in time attack mode.
Source: The Developer Website.