The cost of the game for the store is 100% + 70% = 170% of the cost, which is 1.7 times the cost. We can find the cost of the game for the store by dividing the sale price by 1.7:
Cost = 85 / 1.7 = $50
The profit for the store is the sale price minus the cost:
Profit = 85 - 50 = $35
Therefore, the store's profit is $35. Answer: $35.