Sequence

Sequence is a number pattern puzzle in the IQ Forge series. Each of its 20 rounds shows a row of numbers with one value missing. You pick the right answer from four choices before a 12-second timer runs out. The game pulls from 14 different pattern types, split across three difficulty levels that open up as you move through rounds.

Early rounds keep it simple: add the same number each time, multiply by the same number, or count down. Mid-game rounds get more interesting. They bring in alternating patterns, square numbers, Fibonacci-style sums, and a double-then-add rule. The hardest rounds use powers, triangular numbers, and fully split sequences where every other position follows its own separate rule.

Your score rewards both accuracy and speed. A time bonus and a streak bonus stack on top of the 100-point base. The game trains numerical pattern thinking. That means figuring out a rule from a short list of numbers and using it to find the missing one. This skill shows up in many reasoning tests.

Number sequence puzzles are among the oldest items in ability testing. They first appeared in intelligence assessments in the early 1900s. The idea: find the math rule from the numbers in front of you. No outside knowledge needed — just reason from what's given.

These tasks became a staple of school aptitude tests and job screening through the mid-1900s. Research showed that people who do well on sequences also tend to do well on working memory tests. That makes sense. You have to hold earlier numbers in your head while trying out different rules. That puts real load on short-term memory.

Online sequence puzzles took off in the early 2000s when IQ-style tests became popular on the web. IQ Sequence builds on that tradition. It uses computer-generated patterns across a clear difficulty ladder, so the challenge keeps pace with you.