Focus

Sustained attention and rhythm control

Games in this category

2

Rhythm Trainer Brain Games Tap the spacebar with the beat and measure your timing stability. Keep-Up Hold Brain Games Hold as long as you can — release ends the run.

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Convert between text encodings and data formats

Hash & Crypto13

Hashing, key generation and encryption checks

Data & Format12

Convert and beautify JSON, XML, YAML, CSV

Regex, cron, JWT, SQL and everyday dev helpers

IP, subnet, MAC and port calculations

Case, stats, dedupe and cleanup for text

QR codes, placeholders and image helpers

Percentages, temperature, dates and units

Hand-eye coordination and reaction speed

Sequence and working memory training

Logic, pattern recognition and thinking games