This is the list of hotkeys for use with the level editor:

1 - grass
2 - sand
3 - ice
4 - ladder
5 - 2x2 ice
6 - 3x3 ice
7 - 4x4 ice
8 - 5x5 ice
9 - 6x6 ice
0 - eraser
- - level start
= - level end

z - metal pulley
x - wood pulley
c - crate
v - metal crate
b - barrel
n - left magnet
m - right magnet
, - let bot
. - right bot
/ - trampoline

F1 - frost gun
F2 - EMP
F3 - whistle
F4 - inflatable barrel
F5 - inflatable crate
F6 - inflatable magnet
F7 - blue gate
F8 - yellow gate
F9 - red gate
F10 - blue button
F11 - yellow button
F12 - red button

NUMPAD1 - dawn background
NUMPAD2 - day background
NUMPAD3 - dusk background
NUMPAD4 - night background

L - load
S - save
R - record solution
P - play back solution

CTRL - constrain cursor movement horizontal
SHIFT - constrain cursor movement vertical