Blupi Explorer

This little guy is Blupi. You must help him search for treasures hidden in a castle. There are 22 rooms and chambers in this ancient 4 floor building.
The arrows indicate if Blupi can climb up or down stairs. Sometimes, he may not use them at all.
Blupi can take lifts up or down, but he must be careful not to miss them.
Blupi will find and pick up all sorts of weird objects. He will need them to overcome various obstacles in his quest for the treasures.
For instance, to open a gate, Blupi must have picked up a key first.
You must help Blupi find out what each item is needed for...
Dangerous alien robots will try to stop Blupi. To get past, he must jump over them.
Some of them can be destroyed if Blupi lands on them, others are indestructible.
There are 4 spare Blupis ready to join the fun if Blupi runs into trouble. If you use all 4, you've lost.
If you make Blupi pick up 10 hearts or flowers, an extra spare Blupi comes up.

What is abandonware ?