Controls WASD — move  |  Right-click — look
Q/E — relative up/down  |  R/F — absolute up/down
Shift — sprint  |  Scroll — speed
T — textures on  |  Z — wireframe on
U — texture side outside  |  I — underwater tint on
O — overlap pulse off  |  P — walls off
Ü — thin walls off
1/2/3/4 — level 1/2/3/4 on/off

Speed: normal