Algodoo

This might be the first pinball game, which can be tilted while having multiball feature available at the same time.
Tilting the game while shooting the lock will clear the lock.
Tilting the game without shooting the lock will keep the locked balls, unless it's the last ball in play.
You have 3 balls per play.
Firstly, hit the red target in the middle, then make the right loop to lock the ball.
Locking 3 balls will start multiball.
The controls are as folows:
WSAD - nudge the game
Left and Right arrow keys controls the flippers
Plunger is manual, press the circle on the apron to start the game. You can only do this when the game is over, indicated by the ball counter going above 3.

Version history:
v1.0: Initial release
v1.1: Made the lock kick the stored balls sequentially on game over and at the start of multiball instead of kicking them all at once.