If you go through Groupon
It's always $5 on Tuesday
What everyone else said, but I'd like to add that on Tuesday tickets are automatically $5 even without Groupon regardless of time of day.
Once you purchase on groupon you have to redeem them online. They just started this a couple of months ago
Yes you have to use Groupon to get $5 tickets. You only use Groupon tickets on Friday,Saturday and Sunday before 5PM. Just for weekends only the rest of week is anytime.
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