P – Pencil tool

B – Brush tool

U – Bucket tool

E – Eyedropper tool

Z – Zoom tool

G – Grab tool

O – Toggle original

N – Set to ‘No Block’

[ – Reduce brush size

] – Increase brush size

Arrow keys – Move camera

Mouse wheel press – Grab

Mouse wheel turn – Change scale

Shift + LClick – Draw line from last point

Ctrl + LClick – Quick eyedropper

Ctrl + Z – Undo

Ctrl + Y – Redo