Stomped targets drift in the Moon Room

In the Moon Room's last 20 seconds the targets come back as UFOs, worth 2 points more, and sway sideways as they fly. A target shot with the Bow comes back over the middle of its own path, at its own value. One the player lands on comes back over the spot where it had swayed to, and since only the middle and far targets' places make a target worth more than the nearest, it's worth 3, whatever it was.

With 3 seconds left, the player runs off the ledges and lands on three targets in a row: a UFO, then the middle target and the far one, both swayed well left of their paths. Each comes back as a UFO above the spot where it was stomped, worth 3, and sways on from there; the last bounce takes the player onto the Spikes ^[1].

An arrow's hit makes the new target at xMid, the middle of the old one's path ^[2], but landing on it makes the new one at x, where the old one is ^[3]:

    oMoonRoom.baskets += difficulty;

    instance_create(x, -64, oBatTarget);

Until the last 20 seconds the two are the same. From then on, each step below the top of its path moves the target left of its middle by up to 32 pixels, and nothing moves it back ^[4]:

if (oMoonRoom.timer <= 20 and y > 64)
{
    x = xMid - abs(sin(xDiff)*32);
    xDiff += 0.01;
}

A new target takes its worth from where it's made: 2 at the middle target's place, 4 at the far one's, 1 anywhere else, and 2 more as a UFO ^[5]. Made at a swayed spot, it misses both places, so it's worth 1, 3 as a UFO, and it sways from its new middle, further left ^[6].

Land on a target once the timer reads 20 or less and the target has started to sway: a running jump off the room's ledges reaches the nearest, and its bounce the others. The middle and far targets show it best: shot, they come back worth 4 and 6; stomped, 3. The replay of the clip lands on the near target first, at 17 seconds, whose replacement comes back 23 pixels left of the near target's path, and climbs back to the ledges. At the end it lands on three in a row, and afterwards no target is on the middle or far path, or worth more than 3 ^[7].

The spelunky.ai port reproduces it exactly: it's in docs/quirks.md's list of the 1.1 source's bugs ^[6], and the oracle's fingerprint of the replay pins where each new target is made and what it's worth. No option turns it off.