Scoring

Total score

Score is divided into three portions: accuracy, combo, and bonus. The accuracy and combo portions together comprise the base 1000000 score, and then the bonus is added on top to determine the total score.

accuracy_portion = 0.3
combo_portion = 0.7
total_score = 1000000 * ((accuracy * accuracy_portion) + (combo / max_achievable_combo * combo_portion)) + bonus_portion

These portions can be adjusted by deriving ScoreProcessor:

public class MyScoreProcessor : ScoreProcessor
{
    // Accuracy accounts for up to 950000 of the base score.
    protected override double DefaultAccuracyPortion => 0.95;

    // Combo accounts for up to 50000 of the base score.
    protected override double DefaultComboPortion => 0.05;
}

Hit results

The HitResult class determines which portion(s) of the total score a judgement contributes to, and the amount of health gained or lost. This is defined on a per-hitobject/per-judgement level.

Score

Type	Score	Accuracy portion?	Combo portion?¹	Bonus portion?	Examples	MinResult²
IgnoreMiss³	0	❌	❌	❌	Slider, SpinnerBonus, StrongHit, SwellTick, Banana	-
IgnoreHit³	0	❌	❌	❌	Slider, SwellTick	IgnoreMiss
Miss	0	✅	✅	❌	HitCircle, Hit, Fruit, Note, TailNote	-
Meh	50	✅	✅	❌	HitCircle, Hit, Note, TailNote	Miss
Ok	100	✅	✅	❌	HitCircle, Hit, Note, TailNote	Miss
Good	200	✅	✅	❌	Note, TailNote	Miss
Great	300	✅	✅	❌	HitCircle, Hit, Fruit, Note, TailNote	Miss
Perfect	350	✅	✅	❌	Note, TailNote	Miss
SmallTickMiss	0	✅	❌	❌	SliderTail, SpinnerTick, DrumRollTick, TinyDroplet	-
SmallTickHit	10	✅	❌	❌	SliderTail, SpinnerTick, DrumRollTick, TinyDroplet	SmallTickMiss
LargeTickMiss	0	✅	✅	❌	SliderTick, Droplet	-
LargeTickHit	30	✅	✅	❌	SliderTick, Droplet	LargeTickMiss
SmallBonus	10	❌	❌	✅	StrongHit	IgnoreMiss
LargeBonus	50	❌	❌	✅	SpinnerBonus, Banana	IgnoreMiss

¹ Contribution to the combo portion also implies the combo is increased or decreased for a hit or miss respectively.
² The minimum result is provided for reference to be used in later sections that describe hit result application.
³ All hitobjects must provide a hit result, but "Ignore" results are to be provided when the score should not be affected.

Health

The amount of health increase or decrease is defined relative to a "Perfect" hit result. By default, a "Perfect" hit result increases HP by 5%.

Type	Relative addition
IgnoreMiss	0%
IgnoreHit	0%
Miss	-100%
Meh	-5%
Ok	50%
Good	75%
Great	100%
Perfect	105%
SmallTickMiss	-50%
SmallTickHit	50%
LargeTickMiss	-100%
LargeTickHit	100%
SmallBonus	50%
LargeBonus	100%

These values can be adjusted by deriving Judgement:

public class MyJudgement : Judgement
{
    protected override double HealthIncreaseFor(HitResult result)
    {
        switch (result)
        {
            case HitResult.Good:
                // Make Goods not reduce HP.
                return DEFAULT_MAX_HEALTH_INCREASE * 0.1;

            default:
                return base.HealthIncreaseFor(result);
        }
    }
}

Hitobjects

By default, all HitObject types affect the accuracy and combo portions of the score. When judged, they accept any hit result that is not a tick, bonus, or ignore result.

To change this, derive HitObject and Judgement to set the appropriate Judgement.MaxResult:

public class MySliderTick : HitObject
{
    public override Judgement CreateJudgement() => new MySliderTickJudgement();
}

public class MySliderTickJudgement : Judgement
{
    public override HitResult MaxResult => HitResult.SmallTickHit;
}

This will in-turn change the value of Judgement.MinResult as described by the table above.

Judging

To judge a DrawableHitObject, invoke DrawableHitObject.ApplyResult(Action<JudgementResult> application) and set the appropriate result within the range of Judgement.MinResult and Judgement.MaxResult for the hitobject:

MaxResult	Accepted judgement result types
IgnoreHit	IgnoreHit, IgnoreMiss
Meh	Meh, Miss
Ok	Ok, Meh, Miss
Good	Good, Ok, Meh, Miss
Great	Great, Good, Ok, Meh, Miss
Perfect	Perfect, Great, Good, Ok, Meh, Miss
SmallTickHit	SmallTickHit, SmallTickMiss
LargeTickHit	LargeTickHit, LargeTickMiss
SmallBonus	SmallBonus, IgnoreMiss
LargeBonus	LargeBonus, IgnoreMiss

public class MyDrawableHitObject : DrawableHitObject<MyHitObject>
{
    public MyDrawableHitObject(MyHitObject hitObject)
        : base(hitObject)
    {
    }

    protected override void CheckForResult(bool userTriggered, double timeOffset)
    {
        if (!userTriggered)
        {
            if (timeOffset > HitObject.StartTime)
                ApplyResult(r => r.Type = r.Judgement.MinResult);
        }
        else
            ApplyResult(r => r.Type = r.Judgement.MaxResult);
    }

    protected override bool OnClick(ClickEvent e)
    {
        UpdateResult(true);
        return true;
    }
}

Weighting hitobjects

Nested hitobjects can be used to increase the weighting of hitobjects that are more important than others and should contribute more towards the score:

public class MyHitObject : HitObject
{
    protected override void CreateNestedHitObjects(CancellationToken cancellationToken)
    {
        base.CreateNestedHitObjects(cancellationToken);

        // When applying a result, the same result will also be applied to the padding object (see below).
        // This results in a 2x weighting for the "MyHitObject" type.
        AddNested(new ScorePaddingObject
        {
            // Remember to set a correct start time for nested hitobjects, otherwise their judgements won't be reset correctly!
            // Judgements are only reset once time is rewound past the hitobject's start time.
            StartTime = StartTime
        });

        // For a 3x weighting, add another one!
        // AddNested(new ScorePaddingObject { StartTime = StartTime });
    }
}

public class ScorePaddingObject : HitObject
{
}

public class MyDrawableHitObject : DrawableHitObject<MyHitObject>
{
    private readonly Container<DrawableScorePaddingObject> paddingObjects;

    public MyDrawableHitObject(MyHitObject hitObject)
        : base(hitObject)
    {
        AddInternal(paddingObjects = new Container<DrawableScorePaddingObject>());
    }

    protected override void ClearNestedHitObjects()
    {
        base.ClearNestedHitObjects();
        paddingObjects.Clear();
    }

    protected override void AddNestedHitObject(DrawableHitObject hitObject)
    {
        base.AddNestedHitObject(hitObject);

        if (hitObject is DrawableScorePaddingObject pad)
            paddingObjects.Add(pad);
    }

    protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
    {
        switch (hitObject)
        {
            case ScorePaddingObject pad:
                return new DrawableScorePaddingObject(pad);

            default:
                return base.CreateNestedHitObject(hitObject);
        }
    }

    protected override void CheckForResult(bool userTriggered, double timeOffset)
    {
        if (!userTriggered)
        {
            if (timeOffset > HitObject.StartTime)
                applyResult(false);
        }
        else
            applyResult(true);
    }

    private void applyResult(bool hit)
    {
        ApplyResult(r => r.Type = hit ? r.Judgement.MaxResult : r.Judgement.MinResult);
        foreach (var nested in paddingObjects)
            nested.ApplyResult(r => r.Type = hit ? r.Judgement.MaxResult : r.Judgement.MinResult);
    }

    protected override bool OnClick(ClickEvent e)
    {
        UpdateResult(true);
        return true;
    }
}

public class DrawableScorePaddingObject : DrawableHitObject<ScorePaddingObject>
{
    public DrawableScorePaddingObject(ScorePaddingObject hitObject)
        : base(hitObject)
    {
    }

    public new void ApplyResult(Action<JudgementResult> application) => base.ApplyResult(application);
}