Pins, notation, cross on both sides, corners. Full course with animations and simulator: strefa-kostek.pl/en/kursy
A wheel turns the dials in the 2x2 squares around the pins that are up (on the side in front of you). Always turn the wheel next to a pin that is up - a wheel next to a pin that is down turns the other side. The corner dials are shared by both sides. Hold the Clock with 12 at the top.
WCA notation: UR DR DL UL = one pin up, U D L R = two, ALL = all, ur dr dl ul = all except that one. UR3+ = 3 hours clockwise, UR3- = anticlockwise. y2 = flip like a page (12 stays at the top).
Centre and 4 edges at 12, the corners do not matter.
Rule 1: pins on the side opposite the edge, turn until centre = edge. In order:
Then ALL: turn until the cross shows 12.
y2, then rule 1 as above (L, R, U, D pins) - without ALL at the end. The cross on the first side will not move any more.
The whole side at 12 = the whole Clock solved.
Rule 2: all pins except the pin next to the corner, turn until centre = corner:
Finally ALL: turn until everything shows 12. The corners of the first side solve themselves (they are the same dials).
Turn whichever way is shorter. A pin stuck halfway locks the wheel - push it all the way.