As of update 46.3, the Secret Elemenets menu was removed. It was previously displayed with the keybind RAlt + RCtrl. The elements from it still exist, however the only means to access the ones that only appeared in this menu currently is by console, by pressing "E" and searching one or more of the secret elements, or duplicating them from older saves. This means clicking on them with the left mouse button while holding ALT to begin using them.

MORT

"Steam train." After being placed, it moves either left or right, leaving behind a very thick trail of SMKE, especially useful for smoke grenades.

LOVE

A strong, unknown solid element that forms instantly into the shape of a heart and is colored pink. It can only be accesed by pressing "e" then searching for it.

Destroying love only makes it stronger! When Dropping DEST or destructive bomb on love, more love is created :D Also, unlike most elements, LOVE has a starting temperature of 99.85 degrees Celsius, which is hot enought to turn OIL into GAS. Most substances start at 22 C.

LOLZ

Similar to LOVE, but takes the form of the letters "lol" and is colored dark green.

FRZW

This element is a liquid form of FRZZ, essentially Water below 0 degrees but not ice. It can be created by carefull manual cooling or mixing FRZZ with water .

BIZG

BIZR in gas form, manually created by cooling BIZR.

BIZS

BIZR in solid form, manually created by heating BIZR.

BRAY

BRAY is created from SPRK'ed ARAY. The BRAY element rapidly fades after its creation with a life of 30 frames. If two BRAY's collide, they will form a "solid" BRAY where they intersect that has a life value of about 1000 frames. BRAY's can be colored using FILT. There is also another type of BRAY that is created when the ARAY is sparked by PSCN, it is brown and has a life of only one frame.

SPWN

Functions as a spawn point for Stickman [STKM] if he dies. If more than on is placed on a map, STKM will only respawn on the first one that was placed.

SPN2

Functions as a spawn point for Second Stickman [STK2] if he dies.

DYST

This element is dead yeast. Yeast dies when it is heated too much, or if Neutrons (NEUT) touch it. If dead yeast (DYST) is heated too much it will turn into Dust.

SHLD 1-4

Functions the same as SHLD, it is created when SHLD is Sparked. SHD3 and SHD4 will regenerate particles of SHLD and SHD2 when there is nothing surrounding it (such as when the first two layers are destroyed in an explosion)

EQVE

Equal velocity dust. Originally a test for moving solids, this element currently does not do anything