Goal: Beat the part timer mode (with the 9 default jobs)
Start: Mode select screen with "Drive Power Shovel!" selected
.done: Completed the last job

Controls
D-pad up: Extend arm/stick
D-pad down: Pull arm/stick
D-pad left: Rotate arm left
D-pad right: Rotate arm right
Triangle: Tilt boom down
X: Tilt boom up
Circle: Rotate bucket outwards
Square: Rotate bucket inwards
R1: Right track rotates forward
R2: Right track rotates backwards
L1: Left track rotates forward
L2: Left track rotates backwards

In the menu, navigate to the part timer mode: Drive Power Shovel! > Arcade King > Just do it > Part timer mode
Complete all the jobs without getting a game over.
The first job you select will be in its easiest difficulty and the last job you will complete will in its hardest difficulty.
Each time you fail a job and take a credit to restart it, the difficulty level will drop a bit. You only have 3 credits!
If you get a game over, try to start again with a different job order; place the one you find the most difficult first and the easiest, last.

gl and have fun!