How to Reduce Typing Mistakes: Causes and Fixes From About 30 Million Recorded Misses

We sorted the misses recorded in Typing Musou into types, using the key that was pressed and the situation it happened in. Each miss is counted in exactly one type (types were applied in a fixed priority order so that they do not overlap).

Grouped into four, the picture looks like this.

• Slipped fingers (neighboring key) — about a quarter (24.1%)

  Neighboring-key misses happened 1.56 times as often as they would if keys were pressed at random. Finger slips are real. But judged only by where the pressed key was, before sorting into types, about 64% of misses were not on a neighboring key (about 36% were; other types such as double presses also include neighboring-key presses, which is why this is larger than the 24.1% of this type).

• Mix-ups in the order of keys when building a kana — about 26%

  The total of “pressed a later letter of the same kana first” (14.2%), “pressed the next kana's consonant early” (9.6%) and “skipped the y or h of a contracted sound” (2.2%). The keys themselves are right, but the order in which the kana is built is wrong, or a key in the middle is skipped.

• Misreading or mis-spelling — about 18%

  The total of wrong vowels (8.6%), dropped or added voicing marks (3.3%), the ん situation (3.0%), the small っ situation (2.7%) and needing a small kana with x or l (0.8%). The key that should have been pressed was itself the wrong one.

• Pressing the previous key again — 14.1%

  The next key was a different one, but the key just typed was pressed once more.

The rest is distant keys that fit no type (14.6%) and the same finger on the opposite hand or in another row (1.4% each). The mix also changes by situation: in the Accuracy Drill, 33% of misses were neighboring keys; in battles, 23–25%.

One miss costs about 0.15–0.16 seconds (two estimates compared within the same players gave 154 ms and 161 ms). Recovering takes about 7% of the total time spent on keystrokes.

In battle, the combo matters more than the time. Typing Musou's damage formula has no accuracy term. A miss affects you in two ways: it resets your combo to 0, and only correctly typed keys count toward WPM. The combo is the number of words you finished without a miss, and the multiplier is 1 + 0.025 × combo (capped at ×1.5 at a 20 combo).

The fix depends on the type of mistake. What follows is how to build practice around each type. It is the developer's opinion; there is no data on how much this practice lowers errors.

Chapters 11–15 of the Home Position Dojo deal with contracted sounds, voicing marks, the small tsu and n, finger drills, and the gap between kana. The dojo opens each stage after you clear the previous one, so stage 101 onward comes after stage 100.

• Pressing a neighboring key (about a quarter)

  Examples are r and t, or i and u, swapped. Re-check which finger owns which key, and before you press, be aware of whether your finger is over the target key. In Typing Musou's fingering, r and t belong to the left index finger, and y and u to the right index finger. Dojo chapter 14, “Finger Drills — Same Finger, Next Key, Double Presses” (stages 131–140), is aimed at this type. The finger map is in the home row position diagram.

• Getting the order of keys wrong when building a kana (about 26%)

  Examples: pressing u before r for る (ru), pressing the next kana's consonant early, or skipping the y in きょ (kyo). Split each kana into two beats, consonant then vowel (three beats for a contracted sound: consonant, y, vowel), and repeat the correct order slowly, counting the keys one by one. That is the basic practice. Contracted sounds are covered in chapter 11 (stages 101–110). Spelling-by-spelling tips are in the error-prone characters ranking.

• Misreading or mis-spelling (about 18%)

  A wrong vowel means the sound you read and the vowel you press do not match. In romaji, a voicing mark is not a separate key; the consonant key simply changes (s → z, k → g, t → d, h → b, with p for the ぱ row). Decide your spellings in advance: nn for ん, doubling the next consonant for the small っ, and spellings without small kana for contracted sounds. Voicing marks are chapter 12 (stages 111–120); the small っ and ん are chapter 13 (stages 121–130).

• Pressing the previous key again (14.1%)

  The records do not say why it happens. We think practice that fits is pausing for a beat after a miss to check the next key, and typing one key at a time instead of letting the rhythm carry you into repeats. Chapter 14 also includes double-press drills.

• Distant keys that fit no type (14.6%)

  About 15% of misses were a different key that fit none of the types. We do not guess at a cause here. For lowering misses overall, the Accuracy Drill in the next section is a good fit.

The Accuracy Drill asks you to finish 10 words (4 short, 4 medium, 2 long) with no misses. A single miss ends the run on the spot. The result screen shows “missed at word n / 10”, so you can see where you stopped. Each finished word earns 10 MC, and a full 10-word clear adds +50 MC, for a maximum of 150 MC.

It suits spotting your type of mistake. Because one miss always stops the run, “which word and which kana did I stop at” is clearly left behind each time.

1. 01.Type a little slower than usual and aim for one clean 10-word clear first.
2. 02.When a run ends in a miss, write down the word, the kana where you stopped, and the key you should have pressed and the key you actually pressed.
3. 03.Work out which of the types above the noted case belongs to (for example, you pressed o for きょ (kyo), so you skipped the y).
4. 04.Keep just one fix for that type in mind and try again.
5. 05.Once you clear all 10 words without a miss, raise your speed a little and repeat.

Weak keys are also shown on the result screens of Speed Trial, Mock Combat and battles: the top five keys you missed most in that run (the keys you should have pressed). The Accuracy Drill ends at the first miss, so it normally shows just that one key. In situations where misses pile up, Speed Trial and similar modes show your tendencies more clearly.

The figures in this section come from a fixed 10% sample of the players who allow research use: about 2,500 players and about 2.9 million misses. In that sample, 39.2% of misses were the second or later miss at the same spot. Once you stumble, you tend to keep missing in the same place. In one situation in particular, where a small kana has to be typed with x or l (for example the small ょ after starting きょ with ki), 75% of the first misses went on to keep missing (7,755 spots).

The records do not show why, but the game's rules offer an explanation. In the battles and drills these records come from, a wrong key is not accepted and the text does not advance until you press the right key. For example, if you start きょ by typing ki, the small ょ that follows must begin with x or l (kixyo, kilyo). If you do not know that and keep pressing y or o, every press is counted as another miss.

To recover, follow these steps.

1. 01.After a miss, stop before pressing the same key again.
2. 02.Look at the romaji under the word (the next key to press) and confirm the key. The display follows the spelling you started with.
3. 03.Press the confirmed key. Once the right key is pressed, you continue from where you were. (In the Home Position Dojo, if the wrong letter stays in red, erase it with BackSpace first.)
4. 04.If you land in a situation that needs x or l, start きょ as kyo from next time, with a spelling that includes the y.

We followed the same players through Random Battles (CPU matches included). These are only players who kept going, so people who improve easily may be over-represented.

Speed rose 12–20%, but the miss rate barely moved (−0.3 points at 100 battles, about 0 at 300). Most of the gain came from shorter gaps between keys, especially a 12–20% drop in the time to the next consonant.

Among 5,127 players with 40+ battles, the median WPM gain between the first 10 and the last 10 battles was +6.1 (+15.8%), and 88.6% improved. Looking at each player's trend for 4,909 players with 30+ battles, 63.4% got clearly faster and 2.0% got clearly slower. For miss rate, 19.9% improved and 16.9% worsened, close to even.

Within these records, practice tends to raise speed, while the miss rate does not tend to fall on its own. It seems best to treat mistakes as something you deliberately fix. But causation is unknown: we only followed people who kept going, and did not compare people who practiced reducing misses with people who did not.

Reducing mistakes and getting faster are different matters. For mid-level typists (45–60 WPM), speeding up the join between one kana and the next (the “boundary”) gave a bigger WPM gain in our estimate than bringing mistakes to zero.

The boundary is the time from finishing one kana to pressing the next kana's consonant (for example a → n in かの). It is 38.9% of keystrokes but uses 55.5% of the time spent on keystrokes.

This does not mean that reducing mistakes is pointless. In the 60–80 WPM band, bringing misses to zero is worth about +6 in our estimate, and mistakes weigh more for better typists. Miss rate alone explained only 7% of the differences in WPM between players.

How to speed up the boundary is covered in why your typing isn't getting faster.

By kana type, the number of misses per 100 appearances was 56.9 for foreign-sound kana (like てぃ, ふぁ), 35.7 for contracted sounds (like きゃ, しょ) and 20.0 for the plain kana (か to わ rows). The ranking by kana and tips for typing each are in the error-prone characters ranking.

For a full list of romaji spellings, see the romaji input chart.

• Whose records

  Misses recorded in Typing Musou between 13 May and 18 October 2026 from players who allow their data to be used for research. Players who turned research use off, players who left, and students who joined a school class are excluded.

• Records not included

  Plays with 70% accuracy or lower and matches flagged for suspected cheating are not recorded. The players who struggle most are not in the data.

• People who played this game

  These are records of people who played Typing Musou, not an average of the general public. Age and occupation are unknown.

• Limits of the classification

  Types are assigned from the key pressed and the situation, in a fixed priority order so that they do not overlap. Why a miss happened (tiredness, focus, habit) is not separated out. The numbers do not show cause and effect.

• The fixes

  The fixes are the developer's ideas, built around each type. They are not backed by data measuring their effect.

• Q. What accuracy should I aim for?

  There is no fixed standard. For reference, in Typing Musou's Speed Trial (60 seconds), the middle of the per-player median accuracy was 92.5% (4,942 players, August–October 2026). That is not a goal, only the middle value among people who played. Aiming for one clean 10-word run in the Accuracy Drill is a good first target, and it makes your type of mistake easier to see.

• Q. Are my mistakes caused by tiredness or lack of focus?

  These records cannot tell. Types were sorted by the key pressed and the situation; tiredness and focus were not looked at. If your hands or eyes feel tired, rest. See also when typing tires or hurts your wrists and arms. Typing Musou also shows a notice suggesting a 20-second break after 30 minutes of continuous play.

• Q. Should I avoid typing a small ょ with x or l?

  Both are accepted (きょ can be typed as kyo, kixyo or kilyo). But in the records, where a small kana had to be typed with x or l (for example the ょ after starting きょ with ki), 75% of the first misses led to more misses, and the key-level miss rate for x was 51%. Kyo takes 3 keystrokes against 5 for kixyo. We recommend typing contracted sounds with a spelling that includes the y, such as kyo.

To reduce mistakes, work out your type of mistake and match your practice to it. In Typing Musou's records, neighboring keys were about a quarter, mix-ups in the order of keys when building a kana about 26%, misreading or mis-spelling about 18%, and double presses 14%. One miss costs about 0.15 seconds, plus your combo.

Once you stumble you tend to miss again in the same place, so stop, and confirm the next key before pressing. Practice tends to raise speed while the error rate does not tend to fall by itself, so mistakes are something to fix deliberately. If you are a mid-level typist, give the gaps between kana as much attention as the mistakes.