Offscreen hit objects

4:3 is included in 16:9 and 16:10, the only difference is the width, so you can check for offscreens along the top and bottom in any of these aspect ratios and it will look the same.

A slider end which is partially offscreen along the bottom of the screen.

Reasoning

Although everything is technically readable and playable if an object is only partially offscreen, it trips up players using relative movement input (for example mouse) when their cursor hits the side of the screen, since the game will offset the cursor back into the screen which is difficult to correct while in the middle of gameplay.

Since objects partially offscreen also have a smaller area to hit, if not hitting the screen causing the problems above, it makes those objects need more precision to play which isn't consistent with how the rest of the game works, especially considering that the punishment for overshooting is getting your cursor offset slightly but still hitting the object and not missing like you probably would otherwise.

Outcomes

Offscreen
timestamp - object is offscreen.
Cause: The border of a hit object is partially off the screen in 4:3 aspect ratios.

Prevented
timestamp - object would be offscreen, but the game prevents it.
Cause: The .osu code implies the hit object is in a place where it would be off the 512x512 playfield area, but the game has moved it back inside the screen automatically.

Bezier Margin
timestamp - Slider body is possibly offscreen, ensure the entire white border is visible on a 4:3 aspect ratio.
Cause: The slider body of a bezier slider is approximated to be 1 osu!pixel away from being offscreen at some point on its curve.

Obscured reverse arrows Pattern Lengths

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