People tend to check in during these times:
Food court is the same as LKG Tower but a bit newer
Most of the stalls are closed during Saturdays, Sundays and holidays. If you're working at the GT on those days, bring your baon :)
Try the beefy takoyaki at TK Takoyaki. Not the healthiest but something new on the palate
New York Cafe guys are really nice. Order drinks and they will be happy to deliver it to you wherever at the 12th you are.