Other (objects, etc.) entity

Any surfaces that slowly sink anything on them deeper and deeper until finally suffocating them, though not necessarily lethal if too shallow. This is applicable regardless if it's sand or not, as long as it behaves the same. Not for realistic quicks

The Lost Vikings (Game Boy Advance)
GBA 2003-03-25
Secret of Evermore (Super Nintendo)
SNES 1995-09-18
Prince of Persia 2: The Shadow and the Flame (MS-DOS)
DOS 1993
Toejam & Earl (Mega Drive)
GEN 1991-06-01
The Lost Vikings (Mega Drive)
GEN 1993-05-04
Ys Origin (Windows)
WIN 2006-12
Prince of Persia 2: The Shadow and the Flame (Super Nintendo)
SNES 1996
Prince of Persia 2: The Shadow and the Flame (Macintosh OS Classic)
MAC 1994
The Lost Vikings (MS-DOS)
DOS 1993
Castlevania: Lords of Shadow (Windows)
WIN 2013-08-27
The Lost Vikings (Super Nintendo)
SNES 1993-06
Super Metroid (Super Nintendo)
SNES 1994-03-19

The first video game about Quicksand was released on June 1, 1991.

Interplay and Nintendo has published most of these games

Comparable to water in terms of impeding walking/running but do it much more noticeably (even slower) and do not allow swimming/diving in.

Note that quicksand and similar as seen in fiction, video games, and such do NOT behave like real quicksand. So this is NOT for realistic depiction of quicksand.

Real quicksand is practically just muddy water with the surface overlayed with fine sand on the top that makes it look like safe to pass plain sand but is in reality a (deep) pool of water. The surprise causing most problems, and the murkyness and muddyness makes getting out not as easy, as well as locating actual edge of the potholes.

Dry quicksand - which is essentially much closer to the fictional depictions - has been demonstrated in laboratory experiments, but not yet found in nature.