At the head of the planarian there is a brain under the eyespots. From the brain, there are two nerve cords, which connect at the tail. There are many transverse nerves connected to the nerve cords, which make it look like a ladder. With a ladder-like nerve system it is able to respond in a coordinated manner.
Adventure mode. From Diablo Wiki. Adventure Mode or AM is the primary end game type of game mode introduced into Diablo 3 in the Reaper of Souls expansion pack. Campaign Mode or Story Mode is the other primary game mode, where players must progress through the acts in order, complete quests, talk to NPCs, watch cut scenes, etc.
The Doom Bots of Doom mode. The Doom Bots of Doom, also known as Nightmare mode, is a Featured Game Mode for League of Legends. The first featured mode to utilize bots, this is Co-op vs. AI with a twist: each bot has mutated, granting them empowered abilities. On higher difficulties, Doom Bots will mutate further over the course of the game - picking up the abilities of other champions, alongside their own.