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IHG members (free to join) gets every third night free when you stay in a premium room or suite at select hotels and resorts across Asia Pacific, with complimentary breakfast. Every third night = stay 3 nights, pay for only 2; stay 6, pay 4, stay 9, pay 6 and so on.

Available at participating properties in:Australia & New Zealand
South Pacific
Japan & Micronesia
South East Asia & South Korea
Greater China
IHG Every 3rd Night Free [ihg.com]