Observed arrival · 2026-09-22
SumRace: Fifteen Puzzles Against the Clock
A free collection of maths and logic puzzles with daily challenges, leaderboards, and head-to-head races.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People who enjoy timed maths and logic puzzles
- Worth noticing
- A single seeded daily set is described as identical for everyone, alongside live races against friends.
Field notes
The catalogue covers several distinct puzzle grammars rather than reskinning one format: arithmetic equations, Latin-square constraints, grid visibility clues, binary sequences, and tile movement all appear in the list. SumRace also describes a common seeded daily set, global rankings, and live friend races, although the extract does not independently verify those features beyond the site’s own wording.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
One card from the complete issue