7. Gamma Attack
Price: –
Known Copies: 1
This game is a bit tricky in terms of value. There is only one original copy of the game, although reproduction copies can be bought for around $100. That one copy was never sold, but the owner did put a price tag of $500,000 on it. No one was willing to pay him that amount of money, so we don’t know the real value of the game. But the game is rare, so we decided to put it on our list.
