Angler

Angler draws a figure and a turquoise arc between two rays, then gives four tries to say how many degrees the opening measures. The input fits in a field labeled Your guess in degrees flanked by two arrows, with a Guess! button and an ATTEMPTS counter just below. The game is published on Greatest Games, in the daily visual puzzles section, and the footer announces new games each day at midnight Eastern Time.

1. Read the arc, focusing on the opening: the game's notes remind you that a longer ray does not make the angle wider.
2. Enter the value in degrees into the field, or adjust it with the up and down arrows.
3. Submit with Guess!.
4. Read the tier's color and the arrow, narrow the range, and repeat within the four-attempt limit.

Angler takes a classroom exercise, angle estimation, and gives it the hot-or-cold structure.

Five tiers, and the game publishes their bounds in its own notes: cold beyond a difference of 20°, cool from 11 to 20, warm from 6 to 10, very warm from 3 to 5, burning at 2 or less, all accompanied by a directional arrow. With only four attempts, each tier is worth more than encouragement: it closes an interval.

Daily game

One angle per day, dated in the header. The footer indicates that the site's new games are published each day at midnight Eastern Time.

Leaderboards

A menu entry, and the browser keeps a best score as well as a streak record under the site's keys.

• The game's notes advise starting from known anchors: 90 for a doorframe, 45 for the diagonal, 180 for a flat line, and placing the angle between two of them before typing a number.
• For an arc that makes the long sweep, estimate the small side and subtract from 360: it's the method the game's authors recommend, the eye judging a very wide sweep poorly.