The player initially uses mouse or joystick to control an insect, which must avoid predators, find some food, and then find another insect of the same species and mate with it. The player can then unlock one of several "genes", altering the value of which changes their creature. Some changes are only cosmetic and leave the creature in the same species; others can, for instance, make the initial insect a new species with wings and capable of flight. After unlocking multiple genes the player can become a fast dog-like quadruped, a bird, a scorpion or a humanoid. The game does not end until the player starves, is killed by another creature, or deliberately "evolves" into a plant.
A barge is a flat-bottomed boat, built mainly for river and canal transport of heavy goods. Some barges are not self-propelled and need to be towed or pushed by towboats. Canal barges, towed by draft animals on an adjacent towpath, contended with the railway in the early industrial revolution, but were outcompeted in the carriage of high-value items due to the higher speed, falling costs, and route flexibility of rail.
Barge is attested from 1300, from Old Frenchbarge, from Vulgar Latinbarga. The word originally could refer to any small boat; the modern meaning arose around 1480. Bark "small ship" is attested from 1420, from Old French barque, from Vulgar Latin barca (400 AD). The more precise meaning "three-masted ship" arose in the 17th century, and often takes the French spelling for disambiguation. Both are probably derived from the Latinbarica, from Greekbaris "Egyptian boat", from Copticbari "small boat", hieroglyphic Egyptian
and similar ba-y-r for "basket-shaped boat". By extension, the term "embark" literally means to board the kind of boat called a "barque".