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The Haunted Vending Machine

The object is to insert the indicated amount of coins. However,
the machine seems haunted and keeps rejecting your coins.
Can you persuade the machine to accept your coins?

Insert coins until the vending machine is full of coins
(all switches support one coin).
Notice that you have an unlimited supply of coins.

Use Start to start with the easiest challenge.
Use Previous to go to an easier challenge.
Use Next to go to a harder challenge.
Use Reset to restart the current challenge.
Use Drop-list to select a challenges.
Use Slider to adjust the animation speed.

Insert coins as follows.
Click the coin that you want to insert, or
Press the number (1, 2, 3 etc) of the required coin.