1. There is 5-6 different zones to be explored (+1 if you're engaged).

2. You have one free travel everyday, if you want to travel again it costs 10 diamonds.

3. You can stay in a zone for 8 hours before it resets and you will be returned back to the teleporters.
4. Travel to one of the destinations, open a field for free once in every 40 minutes.

5. You can open extra field before get the next free try for 3 diamonds.
6. When you open a field, its surrounding fields will give you hints
? means that there's a reward in a field nearby, it can be either in the square marked with ? or in some of the 8 squares surrounding it.
X means that there isn't a reward in the fields nearby, under the square marked with X or the surrounding 8 squares.

7. After you collect all rewards from one zone, you will get a special unique extra reward.

8. This kind of event lasts for 14 days.

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TIPS: Join https://www.facebook.com/groups/741455586037324/ for help from other players who is expert and really good at this kind of event..

You need practice? Play Minesweeper game, it's basically the same.