diff --git a/polymer/eduke32/source/lunatic/control.lua b/polymer/eduke32/source/lunatic/control.lua
index 44f092882..1c560b8c3 100644
--- a/polymer/eduke32/source/lunatic/control.lua
+++ b/polymer/eduke32/source/lunatic/control.lua
@@ -1573,6 +1573,8 @@ function _sound(aci, sndidx)
     CF.A_PlaySound(sndidx, aci)
 end
 
+-- NOTE: This command is really badly named in CON. It issues a sound that
+-- emanates from the current player instead of being 'system-global'.
 function _globalsound(pli, sndidx)
     -- TODO: conditional on coop, fake multimode
     if (pli==ffiC.screenpeek) then
diff --git a/polymer/eduke32/source/lunatic/defs.ilua b/polymer/eduke32/source/lunatic/defs.ilua
index 5a84bfcb4..714789829 100644
--- a/polymer/eduke32/source/lunatic/defs.ilua
+++ b/polymer/eduke32/source/lunatic/defs.ilua
@@ -5,6 +5,9 @@ local require = require
 local ffi = require("ffi")
 local ffiC = ffi.C
 
+-- Lua C API functions.
+local CF = CF
+
 local bit = bit
 local string = string
 local table = table
@@ -576,6 +579,7 @@ const char *s_buildRev;
 const char *g_sizes_of_what[];
 int32_t g_sizes_of[];
 int32_t g_elCallDepth;
+int32_t block_deletesprite;
 const char **g_argv;
 const char **g_elModules;
 char g_modDir[];
@@ -775,6 +779,26 @@ do
     actor_static_members.FLAGS = defs_c.conststruct(our_SFLAG)
 end
 
+-- Delete sprite with index <i>.
+-- TODO: make this (also?) sprite.delete() even though it's game-side?
+function actor_static_members.delete(i)
+    check_sprite_idx(i)
+
+    if (ffiC.sprite[i].statnum == ffiC.MAXSTATUS) then
+        error("Attempt to delete a sprite already not in the game world", 2)
+    end
+
+    if (ffiC.block_deletesprite ~= 0) then
+        error("Attempt to delete sprite in EVENT_EGS", 2)
+    end
+
+    if (ffiC.g_player_ps[0].i == i) then
+        error("Attempt to delete player 0's APLAYER sprite", 2)
+    end
+
+    CF.A_DeleteSprite(i)
+end
+
 local tile_static_members = {}
 do
     tile_static_members.sizx = defs_c.creategtab(ffiC.tilesizx, ffiC.MAXTILES, "tilesizx[]")
diff --git a/polymer/eduke32/source/lunatic/dynsymlist b/polymer/eduke32/source/lunatic/dynsymlist
index a86de7331..46d246e7b 100644
--- a/polymer/eduke32/source/lunatic/dynsymlist
+++ b/polymer/eduke32/source/lunatic/dynsymlist
@@ -101,6 +101,7 @@ s_buildRev;
 g_sizes_of_what;
 g_sizes_of;
 g_elCallDepth;
+block_deletesprite;
 g_RETURN;
 g_argv;
 g_elModules;
diff --git a/polymer/eduke32/source/lunatic/geom.lua b/polymer/eduke32/source/lunatic/geom.lua
index 4692763a0..caae5a508 100644
--- a/polymer/eduke32/source/lunatic/geom.lua
+++ b/polymer/eduke32/source/lunatic/geom.lua
@@ -63,7 +63,7 @@ local arshift = require("bit").arshift
 -- The vec3 metatable is shared between the integer- and double-based 3-vector
 -- types. However, some operations are slightly different.
 local vec3_mt = {
-    -- Arithmetic operations. Note that they always return the a dvec3.
+    -- Arithmetic operations. Note that they always return a dvec3.
     __add = function(a, b) return dvec3_t(a.x+b.x, a.y+b.y, a.z+b.z) end,
     __sub = function(a, b) return dvec3_t(a.x-b.x, a.y-b.y, a.z-b.z) end,
     __unm = function(a) return dvec3_t(-a.x, -a.y, -a.z) end,
@@ -92,6 +92,7 @@ local vec3_mt = {
     end,
 
     -- The # operator returns the Euclidean length.
+    -- TODO: REMOVE.
     __len = function(a) return math.sqrt(a.x*a.x + a.y*a.y + a.z*a.z) end,
 
     -- INTERNAL: Calling a vector calls the constructor of its type.
@@ -105,9 +106,17 @@ local vec3_mt = {
     end,
 
     __index = {
+        -- Euclidean 3D length.
+        len = function(a) return math.sqrt(a.x*a.x + a.y*a.y + a.z*a.z) end,
+        -- Euclidean 3D squared length.
         lensq = function(a) return a.x*a.x + a.y*a.y + a.z*a.z end,
 
-        -- Manhattan-distance length:
+        -- Euclidean 2D length.
+        len2 = function(a) return math.sqrt(a.x*a.x + a.y*a.y) end,
+        -- Euclidean 2D squared length.
+        len2sq = function(a) return a.x*a.x + a.y*a.y end,
+
+        -- Manhattan-distance 3D length:
         mhlen = function(a) return math.abs(a.x)+math.abs(a.y)+math.abs(a.z) end,
 
         toivec3 = function(v) return ivec3_t(v.x, v.y, v.z) end,
diff --git a/polymer/eduke32/source/lunatic/lunacon.lua b/polymer/eduke32/source/lunatic/lunacon.lua
index 4482d650b..9ceb59671 100644
--- a/polymer/eduke32/source/lunatic/lunacon.lua
+++ b/polymer/eduke32/source/lunatic/lunacon.lua
@@ -176,7 +176,7 @@ local function new_initial_codetab()
 
         -- Cache globals into locals.
         "local sector, sprite, wall, spriteext, atsprite = sector, sprite, wall, spriteext, atsprite",
-        "local actor, player, projectile = actor, player, projectile",
+        "local actor, player, projectile, g_tile = actor, player, projectile, g_tile",
         "local gameactor, gameevent, _gv = gameactor, gameevent, gv",
         "local updatesector, updatesectorz, cansee = updatesector, updatesectorz, cansee",
         "local print, printf = print, printf",
diff --git a/polymer/eduke32/source/lunatic/lunatic_game.c b/polymer/eduke32/source/lunatic/lunatic_game.c
index a38f15bf2..13e0a8c5a 100644
--- a/polymer/eduke32/source/lunatic/lunatic_game.c
+++ b/polymer/eduke32/source/lunatic/lunatic_game.c
@@ -271,6 +271,7 @@ extern int32_t A_InsertSprite(int32_t whatsect,int32_t s_x,int32_t s_y,int32_t s
                               int32_t s_xr,int32_t s_yr,int32_t s_a,int32_t s_ve,int32_t s_zv,int32_t s_ow,int32_t s_ss);
 extern void A_AddToDeleteQueue(int32_t i);
 extern int32_t A_PlaySound(uint32_t num, int32_t i);
+extern void A_DeleteSprite(int32_t s);
 
 #define LARG(index) lua_tointeger(L, index)
 
@@ -315,6 +316,7 @@ DEFINE_RET_CFUNC(A_InsertSprite, LARG(1), LARG(2), LARG(3), LARG(4), LARG(5), LA
                  LARG(7), LARG(8), LARG(9), LARG(10), LARG(11), LARG(12), LARG(13))
 DEFINE_VOID_CFUNC(A_AddToDeleteQueue, ONE_ARG)
 DEFINE_RET_CFUNC(A_PlaySound, TWO_ARGS)
+DEFINE_VOID_CFUNC(A_DeleteSprite, ONE_ARG)
 
 #define CFUNC_REG(Name) { #Name, Name##_CF }
 
@@ -333,6 +335,7 @@ struct { const char *name; lua_CFunction func; } cfuncs[] =
     CFUNC_REG(A_Spawn),
     CFUNC_REG(A_AddToDeleteQueue),
     CFUNC_REG(A_PlaySound),
+    CFUNC_REG(A_DeleteSprite),
 };
 
 // Creates a global table "CF" containing the functions from cfuncs[].