There are a total of 4 playgrounds suitable for kids aged 1 - 12 years old throughout the terminals and all of them are air-conditioned (thankfully). The different obstacles in the playground will definitely get your kids running about and they'll probably be too preoccupied to notice the time.
Location:
Terminal 1:
Departure Transit Lounge East, next to Outdoor Garden, Level 2, Transit Area;
Terminal 2:
Departure Transit Lounge North, next to the Family Zone, Level 2, Transit Area,
Terminal 3:
Departure Transit Lounge Central, next to SATS Special Service Lounge, Level 2 Transit Area
Departure Transit Lounge, outside gate holdroom A16 - A20, Level 2, Transit Area