I wanna make some sort of special upgrades... please help!?
Is it possible to make an upgrade purchasable again even after I purchase it?
Let's say I have three upgrades.
Upgrade #1, Upgrade #2 and Upgrade #3.
At the start only upgrade #2 is available.
After I purchase upgrade #2 the other two become available and upgrade #2 is disabled.
If I purchase upgrade #1 then it would be like at the start, only upgrade #2 will be available and the other tow are disabled.
If I purchase again upgrade #2 then the other two once again be come available and upgrade #2 is disabled.
If this time I purchase upgrade #3 then upgrade #1 and #3 will be disabled and #2 will be enabled...
And so on....
Possible?
Hope it is...
Thanks in advance.
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