Here's one way to use nested rules in Kodu. In this example, rules 3 and 4 won't run unless rule 2 is true. What we're doing here is using score to keep track of ammo. When the user presses the trigger, we check the score. If it's above zero, we shoot. If it's zero, we play a sad...
PC Kodu is going to have file import and export for Kodu Worlds. This will let you export a world, email it to someone, and have them open it using Kodu on their machine. The goal is to enable you to use *any* sharing mechanism to share Kodu worlds. Want to make a gallery? Great! Use your favorite tool...