Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Phylo puzzle. Players attempt to line up squares of the same colour as best they can minimising the spaces and gaining as many points possible. More species (shown on the left of the screen) are introduced as the level of difficulty of the puzzle increases.
