Green is for everyone, including staff. When I got problems with my card, they used their green card to help me get through. They asked me to exchange for another ticket due to my faulty one. Ticket is blue and valid for 8 days. If you're staying overnight, you'll need to change to another ticket at the internal ticket counters. GPGT:
Green:Blue:Purple:To be continued...
To those who want a blue ticket, just say that you're staying overnight or your card's faulty. They won't check. Btw, 8 days means 8 days internally. Go VivoCity shopping gotta pay another $3 when you wanna come back in.