Week 3 of Trivia Quest has come and gone, with a slew of new tough questions that stumped even the sharpest of knowledge buffs. Episodes 15–21 challenged viewers with topics ranging from dinosaurs to plants, with barely a third of all players managing to crack this week’s hardest question of all. 

The interactive quiz series made its debut at the beginning of April, with viewers returning for a fresh set of 24 questions each day. Whether players choose “easy” or “hard” mode, the object remains the same: Use your knowledge to help Trivia Quest’s animated hero, Willy, save the day.

Ahead, you can catch up on all the info you need for this week’s toughest questions. Study hard — the citizens of Trivia Land are depending on you.

1. Episode 19, hard question #7 30.8% of viewers answered correctly.

The word dinosaur was coined in 1842 by Sir Richard Owen, an English palaeontologist who later established London’s Natural History Museum. And yes, Owen did attend a dinner inside a replica of an iguanodon, along with 21 other high-profile guests. Just an idea for your next dinner party.

2. Episode 18, hard question #4 31.9% of viewers answered correctly.

The festive red and green plant was, in fact, named after Joel Roberts Poinsett, who was a South Carolina representative, foreign minister and secretary of war in the 1800s. In addition to his role as a politician, Poinsett was also a botanist. While in Mexico, he had several poinsettias sent back to his home state of South Carolina, thus introducing the plant to the US.

3. Episode 15, hard question #12 32.8% of viewers answered correctly.

Autostereograms work by hiding a 3D image within repeating 2D patterns, like those found in the Magic Eye books that were popular in the ’90s. Who remembers holding the books as close to your face as possible in order to see the hidden pictures?

4. Episode 21, hard question #9 38.7% of viewers answered correctly.

For Rounders fans, this question was a no-brainer. In the film, Teddy KGB is a big fan of Oreo cookies while playing poker — but what he does with the cookie has a secret meaning. If he breaks it open and doesn’t eat it? Time to call his bluff.

5. Episode 21, hard question #8 41.8% of viewers answered correctly.

Instead of just betting on a single horse, “exacta” betting allows gamblers to bet on two at once. It’s a type of bet that can have a big payoff if you choose wisely.