Thanks to Abidabla for the strategy.

1. Join the city of Yellow (try to don't lose eagle warriors, they are requiered for destroy wonder of orange)

2. When you collect the town center of Yellow, chrono is activated for an "alliance" with Purple or Orange (orange is already your ally but making an alliance is very bad...)

• Standard : 30 minutes IGT
• Moderate : 25 minutes IGT
• Hard : 20 minutes IGT

3. Send your eagle warriors at east of map, change Orange to Enemy and destroy wonder, try to pass Castle Age as fast as possible, you remove the chrono for an "alliance" and Purple will charge at your city

4. Choose the wonder of Purple and GG