Are you ready? HDYK tonight at 8pm ET

Play for your chance to WIN a $100 shopping spree in our store!

[Because of the long weekend, we thought we'd run last Friday's challenge (along with all the links to last week's puzzles) again.]

In case of a site-wide outage later today, if you can't load the final puzzle tonight at 8pm ET, head over to mentalflossHDYK.com, the mirror site, at 8:10pm.

First let's meet our current champion, and big $100 winner, Daniel Wilson. You can read all about him and see the answers to last month's final puzzle here.

As comments have been turned off for the length of the 5-day hunt, be sure to hit us up via e-mail with questions if you find something in the instructions unclear.

As always, it pays to play whether you're the first in with all the correct answers or not. In addition to the $100 shopping spree first-prize, we're also giving away a $50 shopping spree in our store to one random winner who has all the right answers but isn't the first to e-mail them in. Random winners sometimes submit all the correct answers/logic a full 48 hours after the closing bell, so don't worry if you're late or can't submit your final answers at 8 pm ET next Monday.

Have fun with it, and, as always, don't hesitate to work in teams and e-mail all your friends for help. Many, if not most of our past HDYK winners have been teams, not individuals.

If you're new to the 5-day trivia hunt, be sure to see the rules and regulations page here. Also, we've now got a Facebook page which we're going to use to drop cryptic clues now and then. Don't worry, even if you're not a Fan of our Facebook page, you can still view it through the link below, and, of course, you'll still be able to solve all the puzzles, as normal, even if you don't want to visit Facebook. But the Fan page will allow you to friend other contestants, form alliances, network and just hang out with other trivia nuts. So go check it out over here.

If you missed Day 1, you can see that right here, while Day 2 is is over here, and Day 3, right here. Now on to our fourth challenge!

We've got a two-part challenge for you today. This one, we think, is a bit harder than yesterday's. Ready to play? Click on through to the challenge.