.TH CRABS 9.6 .CT 1 games .SH NAME crabs \- graphical marine adventure game .SH SYNOPSIS .B crabs [ .B -i ] [ .B -s .I duration ] [ .B -v .I velocity ] [ .I number ] .SH DESCRIPTION In .IR crabs , difficult situations are encountered in trying to kill or capture crustaceans swarming in a murky sea. You will have to work very rapidly to keep your territory free of seabed intruders. At first, you may even find it hard to keep a clear view of your surroundings, but later discoveries about the spirit of the game will suggest a solution. .PP There are several options. .TP .B -i causes the intruders to play intelligently, allowing them to avoid detection. .TP .B -s simplifies the game for the first .I duration time intervals. Default is 0. 5-10 is recommended for beginners, although you may want to forgo this option the first time, just to see how interesting it can get. .TP .B -v adjusts the velocity of the crabs, 1 being fastest. Default is 5. .PP .I Number specifies the number of intruders. Default is 30.