Thanks!
You can imagine the levels as the points where branches grow in the tree. Bed takes you up the branches, and each bed corresponds to one branch. Spike takes you down the branch you are on, and there is onlz one possible way it can take you.
In the case of this game, zou start at the bottom of the tree, one bed takes you on the left branch but the other takes you on the right branch, and spike always takes you down.
o o
\ /
o