Pokemon Go has only been out in the US since Thursday, but the impact on Nintendo's (TYO:7974) share price is already stunning.
On launch day, based on its share price of ¥14,380, the company was worth around $20 billion.
It rose to $23 billion on Friday.
But fastforward to Monday, and Nintendo's worth is up 40% to $28 billion.
Not bad for a game that's only officially available in Australia, New Zealand, Puerto Rico and the US.
The title's halo effect has even spread to DeNA (TYO:2432), which is working with Nintendo over some of its future mobile games. Ironically, though, DeNA didn't develop Pokemon Go, which is a co-development with San Francisco studio Niantic Labs.