give_paintgun // gives you a paint gun

upgrade_paintgun // gain all the paintgun paints (impulse 101 will also do this, along with the dual portal gun)

nextpaint / prevpaint // toggles between paints

+alt1 // swap between paint gun and portal gun

sv_force_enable_paint_in_map 1 // self explanatory, make sure to restart the map before it works.

ent_create_paint_bomb_reflect // spawns a reflection gel bomb

ent_create_paint_bomb_stick // spawns an adhesion gel bomb

path_vphysics // works as an invisible funnel connected by a path. used for the vactubes in revo.

prop_testchamber_sign // info signs which are entirely editable in hammer, no longer requires editing a script on a per map basis.

info_portal_gamerules // changes various rules for gameplay.

schrödinger's cube (part of prop_weighted_cube) // the teleporty laser cube also used in revo.

cl_portal_sp_primary_color // changes the primary portal colour, format is rgb

cl_portal_sp_secondary_color // same as previous command, but with the secondary portal.

cl_portal_use_new_dissolve // set to 0 to use p1 and hl2's old prop fizzle effect. set to 1 to use p2's

cl_portal_crosshair_mode // toggles between p1 and p2 crosshair behaviour.

cl_mirror_world // flips world rendering horizontally.

mv_duckjump // allows the player to jump while crouched

mv_bhop // enable bunnyhopping

v_view_height // changes the player's view height (def. 64)

v_view_height_ducked # // changes the player view height while ducked (def. 28)

v_view_height_dead # // changes the player view height while dead (def. 14)

the player renders in water reflections now

parallax corrected cubemaps

you can colour lasers and funnels

you can mount other source games, just use mounts.kv in
hammeraddons is automatically included

you can now use panorama ui

new pbr shader

dx11 is now here, dx9 has been removed. vulkan is only available on linux.

engine tools have re-implemented

hammer is much more stable

new physics engine, use -jolt launch command.