click on the text for detail explaination
To access the osu!catch game mode, press Ctrl + 4 at the same time.
Alternatively, click on the Mode button and select osu!mania.
By default, the flow of the notes falls from top to bottom of the conveyor (the starting arrow will show where notes will flow to), with the key control at the bottom and the judgement line above the key control. To change the flow of the playfield from bottom-to-top instead, it can be changed in the Options sidebar; click on osu!mania layout button to set osu!mania keys settings and enable Vertically flip playfield (DDR style) for this key setting manually.
Health bar is located at the right side of the conveyor belt. Please note that health drain is disabled in osu!mania, so only the hit objects will affect the health bar. Combo will not break when playing the keys on empty judgement line.
Scrolling speed of the beat notes can be changed by pressing Ctrl (or Shift) with + (faster) / - (slower) or just F3 (faster) / F4 (slower).
Notes are the hit circles of osu!mania. The falling notes must be tapped on the judgement line, with correct key corresponding to each of the note it falls to. More keys corresponding to the falling notes must be tapped simultaneously if the notes fall simultaneously.
A score burst will be given when tapped a correct key corresponding to the note in the judgement line.
Hold notes are the sliders and spinners of osu!mania. When the hold note reaches the judgement line, tap the starting note in time with correct key, hold, and release it at the ending note of the hold note.
Health bar regeneration occurs slowly while holding the hold note(s). Depending on the song and mapping quirks, it is possible that other notes or hold notes to appear while holding the previous hold note(s).
Do note that the controls information provided below refers to the old key settings used in Options where the keys are mapped relatively and applied to all key settings.
The new key settings require the player to manually set it using the osu!mania layout button provided above for every key layout (unmapped key layouts will use the default key settings instead).
The current default key settings is based on Symmetrical style.
osu!mania key layout
There used to be two different binding-styles, Symmetrical and Left to Right:
Symmetrical style mimics the button placement of DJMAX, in which the centre key is Spacebar to simulate a feeling of stepping the pedal similar to the arcade version. Centre key matches the middle column (odd numbered keys only) and the other column matches the keys in its corresponding place.
Left to Right style mimics the button placement of Beatmania IIDX, where the first column matches to the key1, then the second column matches the key2 and so on.
However, the option to pick had been removed and the current style is based on "Symmetrical" style. For legacy reason, "Left to Right" style is kept here.
Symmetrical key binding (For DJMAX style)
For left hand buttons — (K1)A, (K2)S, (K3)D, (K4)F
For right hand buttons — (K6)J, (K7)K, (K8)L, (K9);.
Center button — (K5)Spacebar. [odd numbered keys only]
The Special button — leftShift [Using special style] and leftCtrl [Alternate binding].
Score in osu!mania is capped at 1 million and consists of two parts, each contributing 50% of the total score:
Base score, which is judgement-centred. Judgement determines a hit object's base scoring value (MAX, 300, 200, 100, 50, or 0 in case of a miss).
Bonus score, which is based on judgement and a floating bonus multiplier, which increases when getting a MAX or a 300, and decreases with a 200 or below.
In addition, score also has the following components:
Accuracy depends on judgement and shows how precise hits are. Late or early key presses, as well as misses, decrease overall accuracy.
Combo shows how many objects were hit in a row. It has no effect on total score and may be broken by a miss.
After completing a beatmap, the score is assigned a grade, a short accuracy assessment in form of a single letter. A golden or silver SS denotes 100% accuracy.