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Every game a cognitive gym
Every keystroke a data point
⌨ core ♪ cascade ◉ echo ∞ relay ▲ prism
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Review Deck practices saved words through repeated definitions, context, and spaced review.
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wpm
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raw
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acc
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streak 🔥
0
target word
ephemeral
adjective
Definition: lasting for a very short time.
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Every game is a cognitive gym

KEYDENZA isn't just a typing test. Each mode trains — and measures — a different real cognitive skill, the kind psychologists have studied for decades. Here's exactly what's happening under your fingertips.

1

The five games

One keyboard, five distinct skills
⌨COREtrains · typing automaticity & flow

The classic speed test — but speed isn't faster fingers. Skilled typing is your brain retrieving stored motor "chunks" instead of computing each key (Logan's instance theory). Experts pre-load the next 4–8 keystrokes before striking the current one. When it clicks, your hands run on autopilot and your mind races ahead — that's flow.

WPMRawCPMAccuracyConsistencyFlow ScoreFluencyDexterityBurst
🎵CASCADEtrains · reaction · rhythm · attention

Words fall; you intercept them before they land. Your brain doesn't just react — it predicts, pre-loading motor plans to the beat (sensorimotor synchronization). And holding focus across a long run fights the vigilance decrement — the documented drift in attention during sustained effort, first measured by Mackworth in 1948.

Perfect / Great / GoodComboAccuracyMotor FocusComposure
👁ECHOtrains · working memory & recall

Words appear, fade, and must be typed from memory. Forgetting here isn't decay — it's interference from the words that came after (Peterson & Peterson, 1959). And pulling a vanished word back strengthens it more than re-reading ever could — the testing effect (Roediger & Karpicke). ECHO is a controlled interference course for your memory.

Recall ratioRecall depthDeep recallsMemoryRetrieval speedMisfires
🔗RELAYtrains · verbal fluency

Type real words starting with a given letter, against the clock. This is the FAS test — a genuine neuropsychology measure. Experts don't search at random: they work in phonetic clusters ("flip, flock, flow") then switch when one runs dry (Troyer et al.). The gaps between your words (inter-response time) are a precise readout of how fast your mental dictionary serves up results.

Retrieval speed (IRT)Vocab depthWordsLongestComposure
🔺PRISMtrains · response inhibition

The Stroop effect (1935) is one of psychology's most replicated findings — reading is so automatic that seeing "RED" in blue ink makes your brain start reading before you can stop it. PRISM weaponizes it: type only when the color matches, hold fire when it doesn't. That suppression is cognitive braking — your prefrontal cortex overriding a deeply trained reflex.

ScoreSurvivedComposure (restraint)Peak mult
2

Your Cognitive Profile

Six dimensions, shared across Cascade · Echo · Relay

KEYDENZA rolls your performance into one shared profile — six dimensions that appear wherever they apply, crowned by a single headline rank.

DevelopingCapableSharpFluentExpertElite
Cognitive Load Abilitythe headline rank
Your mental headroom — how much speed, memory, and inhibition you can juggle at once before performance cracks. Built from every metric below and mapped to a tier from Developing to Elite. (Cognitive load theory — Sweller, 1988.)
Vocabulary Depth
How deep into your mental dictionary you reach. Longer, rarer words live in less-traveled corners and take more effort to retrieve — and counterintuitively, bigger vocabularies access words faster, not slower.
Executive Function
Your mental CEO: holding a rule in mind, juggling objectives, and switching strategy on demand. Strongest in Overload (juggling cycling tiles) and Echo (holding vanished words against interference).
Elite Motor Focus
Sustained typing throughput under pressure — whether your fingers keep pace when the mental load stacks up. The "typing as fast as you think" feeling, measured.
Retrieval Speed
The raw pace of your mental search — the time between one word and the next (inter-response time). It accounts for over half the variance in fluency scores: being fast between words matters more than which words you pick.
Composure
Not how fast — how steady. The consistency of your timing from moment to moment. Speed gets the glory, but low variability is the signature of a skill truly internalized, not just attempted. (Intra-individual variability — Bielak et al., 2010.)
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Every metric, explained

No jargon left behind

Speed & flow — CORE

WPMNet words per minute (5 characters = 1 word), with errors subtracted.
RawEvery keystroke counted — mistakes, backspaces and all.
CPMCharacters per minute — pure finger speed, regardless of word length.
BurstYour fastest single moment — the peak speed over any 10-character window.
FluencyKeystrokes per character. 1.00 = flawless; higher means more backspacing.
DexterityCorrectly-typed "reach" keys — capitals, digits, and symbols.
Flow Score0–100 rhythm steadiness. High = automatic flow; low = effortful, broken rhythm.

Accuracy & consistency

AccuracyFirst-try precision — an error counts even if you backspace and fix it.
ConsistencyHow stable your speed stayed across the whole run. Higher = fewer surges and stalls.

Memory — ECHO

Live / Recalled / MissedCaught while visible / caught from memory after it faded / gone before you got it.
Recall ratioOf the words you cleared, the share you caught from memory rather than on sight.
Recall depthHow deep into a word's fade-out you caught it. Deeper = a harder memory catch.
Deep recallsWords that fully vanished from the screen, yet you still reclaimed them from memory.
MemoryThe live count of vanished words still inside your "claim-from-memory" window.
MisfiresWrong keystrokes on a word you were actively chasing.

Fluency — RELAY

Words / ChainHow many valid words you produced, and your longest unbroken streak.
LongestThe longest single word you found during the round.
Retrieval speedThe median gap between your valid words — how fast your lexicon serves up the next one.

Rhythm & focus — CASCADE · PRISM

Perfect / Great / GoodYour hit-timing tiers — how close to the ideal moment you struck each note.
ComboYour longest unbroken streak of correct hits.
SurvivedHow long you kept your focus bar alive in PRISM before it ran out.
Composure (PRISM)Restraint points — earned for correctly holding fire when nothing matched.
Peak multThe highest momentum multiplier you reached during the run.

The Cognitive Profile

Cognitive Load AbilityHeadline rank — overall capacity under load (Developing → Elite).
Vocab Depth · Exec FunctionLexical reach · working-memory + task-switching under pressure.
Motor Focus · Retrieval · ComposureSustained throughput · search pace · timing steadiness. (See section 2.)
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The science behind it

Grounded in decades of research
Verbal fluency & the FAS testTroyer, Moscovitch & Winocur (1997) · clustering & switching
The Stroop effectMacLeod (1991) · a review of 400+ studies
Automaticity in skilled typingLogan (1988) · instance theory; Salthouse (1986)
The testing effect & working memoryRoediger & Karpicke (2006); Cowan (2001)
Timing consistency (IIV)Bielak et al. (2010) · reaction-time variability
Cognitive load theorySweller (1988) · working-memory capacity under load

A note on honesty

KEYDENZA trains and measures skills — it's a cognitive gym, not a medical device. We make no health, diagnostic, or treatment claims. Practice sharpens the specific skills these games exercise; that's the promise, and it's plenty.

You0
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🎵 CASCADE
rhythm typing — pick a source and difficulty
mode
difficulty Steady
length
reflex mode ? off
hit feedback at note ? off
time
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accuracy
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score: 0
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difficulty: Steady
👁 ECHO
memory & recall — pick a difficulty and word set
difficulty Settle
word set
length
esc to exit
time
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score: 0
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accuracy: 0%recall ratio: 0%recall depth: 0%deep recalls: 0misfires: 0
difficulty: Settleword set: English
cognitive insights
flow score
keystroke rhythm consistency across your tests
Complete a typing test to begin tracking your Flow Score.
typing records
your personal bests and trouble keys across all tests
phase 2
flight time
Average gap between keystrokes — measures typing automaticity and decisiveness under pressure.
phase 3
ERN proxy
Hesitation spike before errors — a behavioral proxy for the brain's error-detection signal.
phase 4
typing signature
Your unique bigram timing fingerprint — builds into a personal cognitive identity across sessions.
phase 5
correction profile
Error rate, catch latency, and backspace precision — measures how accurately you self-monitor.
phase 6
mind drift
Attention lapse detection via digraph latency spikes. Requires a Typing Signature baseline first — comes after Phase 4.
🔗 RELAY
three ways to summon words against the clock
difficulty Steady
loading dictionary…
chain
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longest
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next word starts with ?

chain broken

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longest word: —difficulty: Steady
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type words starting with · 10s
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round over

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longest: —mode: Conjure
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type words starting with a lit letter — fill all to build the word
momentum

overload complete

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longest: —mode: Overload
how to play
PRISM
match the card · simplicity meets Struggle
difficulty
theme
focus100%
score
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mult
×1.0
momentum
color streaks
◉ Prism — how to play
1Cards show a color word. Type the color only when the word matches its color.
2Most cards lie — the word names a different color. Type a lie and your Focus drains hard.
3Focus bleeds over time — bank matches to survive. Run out and the round ends.
4Rare colors pay more. Nail the same color in a row to build a streak multiplier.
5The card you're typing toward freezes so it can't slip away mid-word — every other card keeps moving, and the clock keeps ticking.

Focus lost

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CORE MULTIPLAYER

tug-of-war typing duel · 1v1 · beta
mode
opponent pace
◄ YOU PUSHINGOPPONENT PUSHING ►
READY
PINNED — fills while held at the cap, drains when you fight back0%
● MIRROR LANE — RESCUE ●
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your wpm
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OPP

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escapes

HOW TO PLAY — CORE MULTIPLAYER

Type the passage. Fall behind your opponent and your passage tilts toward unreadable — driven by how far behind you are, and it stops at a cap you can still read.

At the threshold the MIRROR lane slides in: a clean, upright rescue lane showing a narrow window of what is next. You can survive on it, but you lose read-ahead — a lifeline, not a free pass. Typing clean on it pulls your view back toward flat, and pays back more the deeper you are pinned.

KO mode — being held at the cap fills the PINNED meter. Fighting back drains it, so a knockout only lands if you are pinned and not fighting.

RACE mode — first to finish the passage; if neither finishes by the cap, most progress wins.