Evolve or perish in this game, that puts you in control of a not-very-modern Stone Age family. Depending on how adept you are at hunting and gathering in the prehistoric wild, certain abilities — intelligence, running, jumping, even fertility — become more advanced with each generation. Slower than a woolly mammoth, Tail of the Sun won’t likely leave you hollering ”Yabba-dabba-doo,” but it will provide a tranquil alternative to the usual hyperactive videogame fare. B