Launch wave · 01
Numbers
Calculation, numerical fluency and number patterns.
A launch category. Short rounds you can score, then try to beat your own best.
Waitlist open through Nov 30. 200 selected on Dec 1.
Train. Track. Outplay.
TWO5 — Give your brain a run.
Short mental games across numbers, logic, memory and visual reasoning. Build your score, track your personal bests, and challenge yourself to go further.
Round 010:42
Streak04
Your move
Don't just play. Train with purpose.
A round. A score. Another shot at your best.
PlayTrain
Jump into a short challenge.
ScoreTrack
Keep the score. Beat your best.
LaterCompete
Take on someone else, when duels open.
How Two5 works
Pick a challenge. Make your move.
- TWO5Preview
Choose your arena
Find your game
Numbers↗Logic→Computer Science→Memory & Visual→01
Start with a launch arena.
Start with Numbers or Logic. Computer Science and Memory & Visual are planned next. Each arena holds short games, from calculation and number patterns to deduction puzzles.
- TWO5Preview
Choose your mode
Numbers · Number Sprint
Solo
Practise a round
Vs Bot
Sharpen your skills
Challenge a friend
Planned, not open yet
02
Pick a game, then a mode.
Explore sequences, deduction puzzles and other short challenges. Practise solo, take on a bot, or challenge a friend when that mode is supported. Friend challenges are not open yet.
- TWO5Preview
Make your move
Choose your strategy
Risk & Reward
Planned · points shown first
Lock In
Commit to your confidence
Build or Break
Keep the streak alive
03
Play. Score. Improve.
See your result and try to beat your personal best. Risk & Reward, when a game offers it, is a planned way to play it safe or go for a bigger score. The points are shown before you commit. It is not a bet.
- TWO5Planned
Your progress
Numbers · Personal best
SampleBest score
840
Daily 5PlannedPersonal bestSampleChallenge again
04
A new benchmark every round.
Track your best scores, review the round, and return to the challenges you want to master. A shared challenge is part of what comes after launch, not something you can send today.
Train.Compete.Grow.
02 · Arenas
Different games. Different ways to think.
Numbers and Logic are the launch arenas. Computer Science and Memory & Visual are coming in future waves and are not playable yet. The phone is an illustrative preview, not a live game.
Swipe categories →
Launch wave · 02
Logic
Deduction, hidden rules and problem-solving.
A launch category for people who prefer reasoning over fast arithmetic.
Future waves · 03
Computer Science
Code tracing, algorithms and computational thinking.
Planned for later. Not playable at launch, and it will not require a full coding environment.
Future waves · 04
Memory & Visual
Recall, visual recognition and spatial reasoning.
Planned for later. A more visual way to play, not available in the first release.
Limited access
The first round starts with 200.
The waitlist stays open through November 30. On December 1, 200 people are selected. The product launches for them on December 12, and from January 1 each person can invite one player. One invite per person.
- 01
Join the waitlist
Now through November 30
Register your interest and receive launch updates. Joining the waitlist does not guarantee selection.
- 02
200 selected
December 1
Two hundred people are selected and sent a WhatsApp invite. The product is not live yet.
- 03
Product launch
December 12
The product launches only for these 200. Nobody else can play yet.
- 04
One invite each
January 1
Each person can invite one player. One invite per person. That is the first time someone outside the group can join.
Founding players
Be first to test Two5.
The waitlist stays open through November 30. On December 1, 200 people are selected and sent a WhatsApp invite. The product launches for them on December 12.
Not selected? Stay on the waitlist.
200Player slots
01
Train
WhatsApp invite · December 1
02
Compete
Live for the 200 · December 12
03
Grow
One invite per person · January 1
04
Early access
Future features
05
Shape Two5
Before the next wave
How Two5 talks about evidence
Two5 turns brain training into a competition worth coming back to. Take on challenges in mathematics, logic, computer science, and reasoning, sharpen your skills, climb the leaderboards, and prove yourself against other players.
Train.Compete.Grow.
Training is how you earn a better position.
Chase personal bests, protect your position, and come back for the next challenge. No boring repetition — just engaging games that test how you think, reward improvement, and give you something to compete for every day.
Explore the research behind cognitive training →Arena research notes
Includes Zhu et al., 2025. Those papers are not studies of Two5.
Your place in the first round starts here.
Join the Two5 waitlist for a chance to be among the first 200 players selected on December 1.
No payment required. Selection is not guaranteed.
Before you train
Good questions.
Two5 is a mental training and competition platform being built around purposeful challenges, performance feedback, and ways to track progress and compete.
The website and waitlist are live. The waitlist stays open through November 30, 2026. On December 1, 200 people are selected and sent a WhatsApp invite. The product launches for them on December 12. You cannot play a round on this website.
December 1, 2026. A WhatsApp invite is sent to the selected people that day. The product launches for them on December 12.
No. The waitlist is how you ask to be considered, and it stays open through November 30. Two hundred people are selected on December 1. Everyone else can stay on the list.
The product launches on December 12, 2026, only for the 200 selected on December 1. From January 1, 2027, each person can invite one player. One invite per person.
From January 1, 2027, each person can send one invite. One invite per person, for one new player. An invite can fail if it expires, is withdrawn, or breaks the published rules.
Joining the waitlist is free. No payment is taken on this site. Pricing for the product is not set, and this page does not promise that every future feature will stay free. Any paid feature will be explained before launch.
01
What is Two5?
Two5 is a mental training and competition platform being built around purposeful challenges, performance feedback, and ways to track progress and compete.
Guides
Practice the problems Two5 is built around.
Two5 is a mental training ground in development. Numbers and Logic are the launch arenas. Computer Science and Memory & Visual come in later waves. You cannot play a round on this site yet. The first The waitlist stays open through November 30, 2026. On December 1, 200 people are selected and sent a WhatsApp invite. The product launches for them on December 12, and from January 1 each person can invite one player. One invite per person. Read the roadmap for how access works. These guides are practice, with answers. Two5 does not claim to raise IQ. The longer note on what we will not claim is on the About page.
- Number sequence puzzles: patterns, examples, and how to solve themA practical way to spot the rule in a number sequence, with original examples and full answers.
- Logic puzzles with answers: a practical way to solve themOriginal deduction puzzles, each with the answer and the elimination that gets you there.
- Math puzzles for adults: number challenges that make you thinkAdult number challenges that reward a plan, with answers and a clear limit on what practice transfers.
- Algorithm puzzles: computational thinking without writing codeAlgorithm ideas as puzzles: halve a sorted shelf, match brackets with a stack, and trace a procedure by hand.
- Brain games and puzzle challenges: a more competitive way to playCasual puzzles, practice, and scored challenges are different jobs. Here is the split, without a fake ranking of apps.
Evidence