All possible.
Firstly you are probably going to want models. Either search the forums for guns and pack-a-punch, or download my models pack from
this thread.
Secondly, you will need to learn to use Alice properly, primarily variables and key events if you want to make either of these worlds.
Thirdly you may want to learn how to do mouse aiming, search the forums as there are threads on this.
Fourthly you may want to learn collision detection, again search the forums, there are plenty of tutorials.
Finally to do game saving use my
IO Tool.
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I have mostly moved on from Alice, but may still respond to messages if important [¬º-°]¬