Looking for the most recent Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle, Connections: Sports Edition and Strands puzzles.

Today’s NYT Connections puzzle is kind of tough. I just lucked into solving the purple category. Read on for clues and today’s Connections answers.

The Times has a Connections Bot, like the one for Wordle. Go there after you play to receive a numeric score and to have the program analyze your answers. Players who are registered with the Times Games section can now nerd out by following their progress, including the number of puzzles completed, win rate, number of times they nabbed a perfect score and their win streak.

Read more: Hints, Tips and Strategies to Help You Win at NYT Connections Every Time

Hints for today’s Connections groups

Here are four hints for the groupings in today’s Connections puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Look it up.

Green group hint: Nostalgia time.

Blue group hint: Psychology 101.

Purple group hint: Call me up.

Answers for today’s Connections groups

Yellow group: Reference books.

Green group: Something that brings back memories.

Blue group: Kinds of complexes.

Purple group: Starting with ways to reach someone via phone.

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections answers?

The yellow words in today’s Connections

The theme is reference books. The four answers are atlas, dictionary, encyclopedia and thesaurus.

The green words in today’s Connections

The theme is something that brings back memories. The four answers are echo, reminder, trace and vestige.

The blue words in today’s Connections

The theme is kinds of complexes. The four answers are Electra, inferiority, Oedipus and superiority.

The purple words in today’s Connections

The theme is starting with ways to reach someone via phone. The four answers are buzzard (buzz), calliope (call), dialect (dial) and ringmaster (ring).