diff --git a/src/doomdata.h b/src/doomdata.h
index 767e47383..f42b13889 100644
--- a/src/doomdata.h
+++ b/src/doomdata.h
@@ -215,4 +215,11 @@ typedef struct
 
 #define NUMMAPS 1035
 
+/* slope thing types */
+enum
+{
+	FLOOR_SLOPE_THING   = 777,
+	CEILING_SLOPE_THING = 778,
+};
+
 #endif // __DOOMDATA__
diff --git a/src/p_mobj.c b/src/p_mobj.c
index d58772f5c..c309b6a4f 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -12072,6 +12072,8 @@ void P_SpawnMapThing(mapthing_t *mthing)
 
 	else if (mthing->type == 750) // Slope vertex point (formerly chaos spawn)
 		return;
+	else if (mthing->type == 777 || mthing->type == 778) // Slope anchors
+		return;
 
 	else if (mthing->type == 300 // Ring
 		|| mthing->type == 308 || mthing->type == 309 // Team Rings
diff --git a/src/p_setup.c b/src/p_setup.c
index c2af9b3b2..6b92a405f 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -3206,19 +3206,24 @@ boolean P_SetupLevel(boolean skipprecip)
 	// anything that P_ResetDynamicSlopes/P_LoadThings needs to know
 	P_InitSpecials();
 
+	// set up world state
+	// jart: needs to be done here so anchored slopes know the attached list
+	P_SpawnSpecials(fromnetsave);
+
 	P_ResetDynamicSlopes();
 
 	P_LoadThings();
 
+	P_RaiseThings();
+
+	P_SpawnSpecialsThatRequireObjects();
+
 	P_SpawnSecretItems(loademblems);
 
 	for (numcoopstarts = 0; numcoopstarts < MAXPLAYERS; numcoopstarts++)
 		if (!playerstarts[numcoopstarts])
 			break;
 
-	// set up world state
-	P_SpawnSpecials(fromnetsave);
-
 	K_AdjustWaypointsParameters();
 
 	if (loadprecip) //  ugly hack for P_NetUnArchiveMisc (and P_LoadNetGame)
diff --git a/src/p_slopes.c b/src/p_slopes.c
index d90b583c5..2102dd7b2 100644
--- a/src/p_slopes.c
+++ b/src/p_slopes.c
@@ -24,6 +24,9 @@
 #include "w_wad.h"
 #include "k_kart.h" // K_PlayerEBrake
 
+static void P_BuildSlopeAnchorList (void);
+static void P_SetupAnchoredSlopes  (void);
+
 
 static pslope_t *slopelist = NULL;
 static UINT16 slopecount = 0;
@@ -731,6 +734,14 @@ void P_ResetDynamicSlopes(void) {
 		}
 	}
 
+	// jart
+
+	/// Build list of slope anchors--faster searching.
+	P_BuildSlopeAnchorList();
+
+	/// Setup anchor based slopes.
+	P_SetupAnchoredSlopes();
+
 	/// Copies slopes from tagged sectors via line specials.
 	/// \note Doesn't actually copy, but instead they share the same pointers.
 	for (i = 0; i < numlines; i++)
@@ -920,5 +931,8 @@ void P_ButteredSlope(mobj_t *mo)
 	P_Thrust(mo, mo->standingslope->xydirection, thrust);
 }
 
+// jart
+#include "slope_anchors.c"
+
 // EOF
 #endif // #ifdef ESLOPE
diff --git a/src/p_spec.c b/src/p_spec.c
index 4c86714eb..84b4a7dd1 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -5358,6 +5358,26 @@ P_RaiseTaggedThingsToFakeFloor (
 	}
 }
 
+void
+P_RaiseThings (void)
+{
+	size_t i;
+
+	for (i = 0; i < numlines; ++i)
+	{
+		switch (lines[i].special)
+		{
+			case 80: // Raise tagged things by type to this FOF
+				P_RaiseTaggedThingsToFakeFloor(
+						( sides[lines[i].sidenum[0]].textureoffset >> FRACBITS ),
+						lines[i].tag,
+						lines[i].frontsector
+				);
+				break;
+		}
+	}
+}
+
 //
 // SPECIAL SPAWNING
 //
@@ -6822,28 +6842,19 @@ void P_SpawnSpecials(INT32 fromnetsave)
 		}
 	}
 
-	/* some things have to be done after FOF spawn */
-
-	for (i = 0; i < numlines; ++i)
-	{
-		switch (lines[i].special)
-		{
-			case 80: // Raise tagged things by type to this FOF
-				P_RaiseTaggedThingsToFakeFloor(
-						( sides[lines[i].sidenum[0]].textureoffset >> FRACBITS ),
-						lines[i].tag,
-						lines[i].frontsector
-				);
-				break;
-		}
-	}
-
 	// Allocate each list
 	for (i = 0; i < numsectors; i++)
 		if(secthinkers[i].thinkers)
 			Z_Free(secthinkers[i].thinkers);
 
 	Z_Free(secthinkers);
+}
+
+/** Fuck polyobjects
+  */
+void P_SpawnSpecialsThatRequireObjects(void)
+{
+	size_t i;
 
 	// haleyjd 02/20/06: spawn polyobjects
 	Polyobj_InitLevel();
diff --git a/src/p_spec.h b/src/p_spec.h
index 6c918ef11..24bbfadd9 100644
--- a/src/p_spec.h
+++ b/src/p_spec.h
@@ -38,6 +38,8 @@ void P_SetupLevelFlatAnims(void);
 // at map load
 void P_InitSpecials(void);
 void P_SpawnSpecials(INT32 fromnetsave);
+void P_RaiseThings(void);
+void P_SpawnSpecialsThatRequireObjects(void);
 
 // every tic
 void P_UpdateSpecials(void);
@@ -461,4 +463,12 @@ void P_CalcHeight(player_t *player);
 
 sector_t *P_ThingOnSpecial3DFloor(mobj_t *mo);
 
+/* line specials */
+enum
+{
+	LT_SLOPE_ANCHORS_FLOOR   = 777,
+	LT_SLOPE_ANCHORS_CEILING = 778,
+	LT_SLOPE_ANCHORS         = 779,
+};
+
 #endif
diff --git a/src/slope_anchors.c b/src/slope_anchors.c
new file mode 100644
index 000000000..d66c9d9dd
--- /dev/null
+++ b/src/slope_anchors.c
@@ -0,0 +1,491 @@
+// SONIC ROBO BLAST 2 KART
+//-----------------------------------------------------------------------------
+// Copyright (C) 2020 by James R.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+/// \brief Charyb's vertex slope anchors.
+///        This file is self contained to avoid a Big Large merge conflict.
+
+/*
+FIXME
+FIXME
+FIXME
+FIXME	WHEN 2.2 MERGE IS OVER, REFACTOR A LOT OF THE CODE IN P_SLOPES.C AND
+FIXME	MAKE THIS NOT REDUNDANT.
+FIXME
+FIXME
+FIXME
+*/
+
+struct anchor_list
+{
+	mapthing_t     ** anchors;
+	const vertex_t ** points;
+	fixed_t         * closeness;
+	size_t            count;
+};
+
+struct anchor_list   floor_anchors;
+struct anchor_list ceiling_anchors;
+
+static void * new_list (size_t n) {
+	return Z_Malloc(n, PU_LEVEL, NULL);
+}
+
+static void make_new_anchor_list (struct anchor_list * list) {
+	list->anchors   = new_list(list->count * sizeof *list->anchors);
+	list->points    = new_list(list->count * sizeof *list->points);
+	list->closeness = new_list(list->count * sizeof *list->closeness);
+}
+
+static void allocate_anchors (void) {
+	size_t i;
+
+	floor_anchors.count = 0;
+	ceiling_anchors.count = 0;
+
+	for (i = 0; i < nummapthings; ++i)
+	{
+		switch (mapthings[i].type)
+		{
+			case FLOOR_SLOPE_THING:
+				floor_anchors.count++;
+				break;
+
+			case CEILING_SLOPE_THING:
+				ceiling_anchors.count++;
+				break;
+		}
+	}
+
+	make_new_anchor_list(&floor_anchors);
+	make_new_anchor_list(&ceiling_anchors);
+}
+
+static void
+compare_vertex_distance
+(
+		const vertex_t ** nearest,
+		fixed_t         * nearest_distance,
+		const fixed_t     origin_x,
+		const fixed_t     origin_y,
+		const vertex_t  * v
+){
+	const fixed_t distance = abs(P_AproxDistance
+			(
+				origin_x - v->x,
+				origin_y - v->y
+			));
+
+	if (distance < (*nearest_distance))
+	{
+		(*nearest) = v;
+		(*nearest_distance) = distance;
+	}
+}
+
+static const vertex_t *
+nearest_point
+(
+		fixed_t           * closeness,
+		mapthing_t        * a,
+		const sector_t    * sector
+){
+	const fixed_t x = a->x << FRACBITS;
+	const fixed_t y = a->y << FRACBITS;
+
+	const vertex_t * v = NULL;/* shut compiler up, should never be NULL */
+
+	size_t i;
+
+	(*closeness) = INT32_MAX;
+
+	for (i = 0; i < sector->linecount; ++i)
+	{
+		compare_vertex_distance(&v, closeness, x, y, sector->lines[i]->v1);
+		compare_vertex_distance(&v, closeness, x, y, sector->lines[i]->v2);
+	}
+
+	return v;
+}
+
+static INT16
+anchor_height
+(
+		const mapthing_t * a,
+		const sector_t   * s
+){
+	{
+		INT16 z = ( a->options >> ZSHIFT );
+
+		if (a->options & MTF_OBJECTFLIP)
+		{
+			return ( s->ceilingheight >> FRACBITS ) - z;
+		}
+		else
+		{
+			return ( s->floorheight >> FRACBITS ) + z;
+		}
+	}
+}
+
+static void
+set_anchor
+(
+		struct anchor_list * list,
+		mapthing_t         * a
+){
+	const subsector_t * sub = R_PointInSubsector
+		(
+				a->x << FRACBITS,
+				a->y << FRACBITS
+		);
+
+	const vertex_t * v;
+
+	fixed_t closeness;
+
+	a->z = anchor_height(a, sub->sector);
+
+	v = nearest_point(&closeness, a, sub->sector);
+
+	a->x = ( v->x >> FRACBITS );
+	a->y = ( v->y >> FRACBITS );
+
+	list->anchors  [list->count] = a;
+	list->points   [list->count] = v;
+	list->closeness[list->count] = closeness;
+
+	list->count++;
+}
+
+static void build_anchors (void) {
+	size_t i;
+
+	floor_anchors.count = 0;
+	ceiling_anchors.count = 0;
+
+	for (i = 0; i < nummapthings; ++i)
+	{
+		switch (mapthings[i].type)
+		{
+			case FLOOR_SLOPE_THING:
+				set_anchor(&floor_anchors, &mapthings[i]);
+				break;
+
+			case CEILING_SLOPE_THING:
+				set_anchor(&ceiling_anchors, &mapthings[i]);
+				break;
+		}
+	}
+}
+
+static void
+get_anchor
+(
+		mapthing_t               **      anchors,
+		fixed_t                     distances[3],
+		const struct anchor_list  * list,
+		const INT16                 tag,
+		const vertex_t            * v
+){
+	size_t i;
+
+	int k;
+
+	for (i = 0; i < list->count; ++i)
+	{
+		if (list->points[i] == v && list->anchors[i]->extrainfo == tag)
+		{
+			for (k = 0; k < 3; ++k)
+			{
+				if (list->closeness[i] < distances[k])
+				{
+					if (k == 0)
+					{
+						distances[2] = distances[1];
+						distances[1] = distances[0];
+
+						anchors  [2] = anchors  [1];
+						anchors  [1] = anchors  [0];
+					}
+					else if (k == 1)
+					{
+						distances[2] = distances[1];
+						anchors  [2] = anchors  [1];
+					}
+
+					distances[k] = list->closeness[i];
+
+					anchors[k] = list->anchors[i];
+
+					break;
+				}
+				else if (list->anchors[i] == anchors[k])
+				{
+					break;
+				}
+			}
+		}
+	}
+}
+
+static void
+get_sector_anchors
+(
+		mapthing_t               **      anchors,
+		fixed_t                     distances[3],
+		const struct anchor_list  * list,
+		const INT16                 tag,
+		const sector_t            * sector
+){
+	size_t i;
+
+	for (i = 0; i < sector->linecount; ++i)
+	{
+		get_anchor(anchors, distances, list, tag, sector->lines[i]->v1);
+		get_anchor(anchors, distances, list, tag, sector->lines[i]->v2);
+	}
+}
+
+static mapthing_t **
+find_closest_anchors
+(
+		const sector_t           * sector,
+		const struct anchor_list * list,
+		const INT16                tag
+){
+	fixed_t distances[3] = { INT32_MAX, INT32_MAX, INT32_MAX };
+
+	mapthing_t ** anchors;
+
+	int last = 0;
+
+	size_t i;
+
+	if (list->count < 3)
+	{
+		I_Error("At least three slope anchors are required to make a slope.");
+	}
+
+	anchors = Z_Malloc(3 * sizeof *anchors, PU_LEVEL, NULL);
+
+	if (sector->numattached > 0)
+	{
+		for (i = 0; i < sector->numattached; ++i)
+		{
+			get_sector_anchors
+				(anchors, distances, list, tag, &sectors[sector->attached[i]]);
+		}
+	}
+	else
+	{
+		get_sector_anchors(anchors, distances, list, tag, sector);
+	}
+
+	if (distances[2] < INT32_MAX)
+	{
+		return anchors;
+	}
+
+	if (distances[1] < INT32_MAX)
+		last = 2;
+	else if (distances[0] < INT32_MAX)
+		last = 1;
+	else
+		last = 0;
+
+	if (sector->numattached > 0)
+	{
+		CONS_Printf("\nSearched for anchors in sectors...\n\n");
+
+		for (i = 0; i < sector->numattached; ++i)
+		{
+			CONS_Printf("#%s\n", sizeu1 (sector->attached[i]));
+		}
+
+		I_Error(
+				"(Control Sector #%s)"
+				" Slope requires anchors (with Parameter %d)"
+				" near 3 of its target sectors' vertices (%d found)"
+
+				"\n\nCheck the log to see which sectors were searched.",
+
+				sizeu1 (sector - sectors),
+				tag,
+				last
+		);
+	}
+	else
+	{
+		I_Error(
+				"(Sector #%s)"
+				" Slope requires anchors (with Parameter %d)"
+				" near 3 of its vertices (%d found)",
+
+				sizeu1 (sector - sectors),
+				tag,
+				last
+		);
+	}
+}
+
+static pslope_t *
+new_vertex_slope
+(
+		mapthing_t  ** anchors,
+		const INT16    flags
+){
+	pslope_t * slope = Z_Calloc(sizeof (pslope_t), PU_LEVEL, NULL);
+
+	slope->flags = SL_VERTEXSLOPE;
+
+	if (flags & ML_NOSONIC)
+	{
+		slope->flags |= SL_NOPHYSICS;
+	}
+
+	if (( flags & ML_NOTAILS ) == 0)
+	{
+		slope->flags |= SL_NODYNAMIC;
+	}
+
+	slope->vertices = anchors;
+
+	P_ReconfigureVertexSlope(slope);
+	slope->refpos = 5;
+
+	// Add to the slope list
+	slope->next = slopelist;
+	slopelist = slope;
+
+	slopecount++;
+	slope->id = slopecount;
+
+	return slope;
+}
+
+static mapthing_t **
+flip_slope
+(
+		mapthing_t     ** origin,
+		const sector_t  * sector
+){
+	mapthing_t  * copy    = Z_Malloc(3 * sizeof (mapthing_t),   PU_LEVEL, NULL);
+	mapthing_t ** anchors = Z_Malloc(3 * sizeof (mapthing_t *), PU_LEVEL, NULL);
+
+	size_t i;
+
+	for (i = 0; i < 3; ++i)
+	{
+		memcpy(&copy[i], origin[i], sizeof copy[i]);
+
+		copy[i].options ^= MTF_OBJECTFLIP;
+		copy[i].z = anchor_height(&copy[i], sector);
+
+		anchors[i] = &copy[i];
+	}
+
+	return anchors;
+}
+
+static void
+slope_sector
+(
+		pslope_t                ** slope,
+		pslope_t                ** alt,
+		sector_t                 * sector,
+		const INT16                flags,
+		const struct anchor_list * list,
+		const INT16                tag
+){
+	mapthing_t ** anchors = find_closest_anchors(sector, list, tag);
+
+	if (anchors != NULL)
+	{
+		(*slope) = new_vertex_slope(anchors, flags);
+
+		/* No Knuckles - invert slope to opposite side */
+		if (flags & ML_NOKNUX)
+		{
+			(*alt) = new_vertex_slope(flip_slope(anchors, sector), flags);
+		}
+
+		sector->hasslope = true;
+	}
+}
+
+static void
+make_anchored_slope
+(
+		const line_t * line,
+		const int      plane
+){
+	enum
+	{
+		FLOOR   = 0x1,
+		CEILING = 0x2,
+	};
+
+	INT16 flags = line->flags;
+
+	const int side = ( flags & ML_NOCLIMB ) != 0;
+
+	sector_t   *  s;
+
+	if (side == 0 || flags & ML_TWOSIDED)
+	{
+		s = sides[line->sidenum[side]].sector;
+
+		if (plane == (FLOOR|CEILING))
+		{
+			flags &= ~ML_NOKNUX;
+		}
+
+		if (plane & FLOOR)
+		{
+			slope_sector
+				(&s->f_slope, &s->c_slope, s, flags, &floor_anchors, line->tag);
+		}
+
+		if (plane & CEILING)
+		{
+			slope_sector
+				(&s->c_slope, &s->f_slope, s, flags, &ceiling_anchors, line->tag);
+		}
+	}
+}
+
+static void P_BuildSlopeAnchorList (void) {
+	allocate_anchors();
+	build_anchors();
+}
+
+static void P_SetupAnchoredSlopes (void) {
+	enum
+	{
+		FLOOR   = 0x1,
+		CEILING = 0x2,
+	};
+
+	size_t i;
+
+	for (i = 0; i < numlines; ++i)
+	{
+		if (lines[i].special == LT_SLOPE_ANCHORS_FLOOR)
+		{
+			make_anchored_slope(&lines[i], FLOOR);
+		}
+		else if (lines[i].special == LT_SLOPE_ANCHORS_CEILING)
+		{
+			make_anchored_slope(&lines[i], CEILING);
+		}
+		else if (lines[i].special == LT_SLOPE_ANCHORS)
+		{
+			make_anchored_slope(&lines[i], FLOOR|CEILING);
+		}
+	}
+}