Here is what you do. You put a picture and tell me a price. And then a CPU (computer) will buy it if its a good price.
When you have allot of money, ill let you buy special cards.
x2 money ( 3 000 000 000$)
x3 money ( 5 000 000 000$)
allowing illegal items ( 100 000 000 000$)
Any of these will last for 1 hour.
Illegal pictures:
Extremely huge stuffs like planets or the sun.
Special cards
Humans
ALL THE REST, you are aloud to sell.
Ill let 10 people join for now.
Ill put leaderboard.
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By the way, you could sell anything except for illegal stuffs except if you have the card.
Expensive stuffs:
Cars
Structures
Gold
Crystals
Technologies
Tickets