How to play this game.
1. Choose any of all the cards when you start.
2. Find the card which has JUST ONE change.
3. Time penalty with wrong choice.
4. Press 'Next Stage' when no more cards to select.
5. Bonus points and extra time with 'Next Stage' success!!
It's simple but a little bit difficult.
100% sure to upgrade your brain with 'JUST ONE'.