I think this works now?

_maps/toolbox_arenas/arena_bomberman.dmm

@@ -0,0 +1,315 @@
+//MAP CONVERTED BY dmm2tgm.py THIS HEADER COMMENT PREVENTS RECONVERSION, DO NOT REMOVE
+"a" = (
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"f" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 4
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"g" = (
+/obj/structure/barricade/bomberman/powerup/mirror,
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"h" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 14
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"j" = (
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"k" = (
+/obj/structure/barricade/bomberman/powerup,
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"m" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 10
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"p" = (
+/obj/structure/barricade/bomberman/powerup/mirror,
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"x" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 6
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"A" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 6
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"B" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 16
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"D" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 12
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"E" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 10
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"G" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 14
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"J" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 8
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"L" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 4
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"M" = (
+/turf/closed/indestructible/bombermanwall,
+/area/centcom/tdome/arena)
+"P" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 12
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"Q" = (
+/obj/structure/barricade/bomberman/powerup,
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+"W" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 16
+	},
+/turf/open/misc/grass/jungle,
+/area/centcom/tdome/arena)
+"Z" = (
+/obj/structure/barricade/bomberman/powerup/mirror{
+	mirror_distance = 8
+	},
+/turf/open/floor/grass,
+/area/centcom/tdome/arena)
+
+(1,1,1) = {"
+a
+j
+B
+W
+B
+W
+B
+W
+a
+j
+"}
+(2,1,1) = {"
+j
+M
+h
+M
+h
+G
+M
+G
+M
+a
+"}
+(3,1,1) = {"
+D
+P
+D
+P
+D
+P
+D
+P
+D
+P
+"}
+(4,1,1) = {"
+m
+M
+m
+M
+m
+E
+M
+E
+M
+E
+"}
+(5,1,1) = {"
+Z
+J
+Z
+J
+Z
+J
+Z
+J
+Z
+J
+"}
+(6,1,1) = {"
+x
+M
+x
+M
+x
+A
+M
+A
+M
+A
+"}
+(7,1,1) = {"
+f
+L
+f
+L
+a
+j
+f
+L
+f
+L
+"}
+(8,1,1) = {"
+p
+M
+p
+a
+j
+a
+j
+g
+M
+g
+"}
+(9,1,1) = {"
+Q
+k
+Q
+j
+a
+j
+a
+k
+Q
+k
+"}
+(10,1,1) = {"
+j
+M
+j
+a
+j
+a
+j
+a
+M
+a
+"}
+(11,1,1) = {"
+a
+j
+a
+j
+a
+j
+a
+j
+a
+j
+"}
+(12,1,1) = {"
+j
+M
+j
+M
+j
+a
+M
+a
+M
+a
+"}
+(13,1,1) = {"
+a
+j
+a
+j
+a
+j
+a
+j
+a
+j
+"}
+(14,1,1) = {"
+j
+M
+j
+M
+j
+a
+M
+a
+M
+a
+"}
+(15,1,1) = {"
+a
+j
+a
+j
+a
+j
+a
+j
+a
+j
+"}
+(16,1,1) = {"
+j
+M
+j
+M
+j
+a
+M
+a
+M
+a
+"}
+(17,1,1) = {"
+a
+j
+a
+j
+a
+j
+a
+j
+a
+j
+"}

modular_event/bomberman/powerup.dm

@@ -0,0 +1,75 @@
+/obj/effect/powerup/bomberman
+	icon = 'modular_event/bomberman/bomberman_icons.dmi'
+	pickup_sound = 'sound/machines/synth_yes.ogg'
+
+/obj/effect/powerup/bomberman/trigger(mob/living/target)
+	. = ..()
+	if(!.)
+		return
+	target.balloon_alert_to_viewers(name)
+
+/obj/effect/powerup/bomberman/speed
+	name = "speed up"
+	desc = "Makes you slightly faster."
+	icon_state = "speedup"
+
+/obj/effect/powerup/bomberman/speed/trigger(mob/living/target)
+	. = ..()
+	if(!.)
+		return
+	if (target.has_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/fourth)) 
+		return
+	if (target.has_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/third))
+		target.remove_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/third)
+		target.add_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/fourth)
+		return
+	if (target.has_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/second))
+		target.remove_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/second)
+		target.add_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/third)
+		return
+	if (target.has_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/first))
+		target.remove_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/first)
+		target.add_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/second)
+		return
+	target.add_movespeed_modifier(/datum/movespeed_modifier/bomberman_speed/first)//WHO ON EARTH LET ME COOK
+
+/datum/movespeed_modifier/bomberman_speed
+
+/datum/movespeed_modifier/bomberman_speed/first //Turning tracking how many boosts you have into a component would be better but too bad.
+	multiplicative_slowdown = -0.15
+
+/datum/movespeed_modifier/bomberman_speed/second
+	multiplicative_slowdown = -0.3
+
+/datum/movespeed_modifier/bomberman_speed/third
+	multiplicative_slowdown = -0.45
+
+/datum/movespeed_modifier/bomberman_speed/fourth
+	multiplicative_slowdown = -0.6
+
+/obj/effect/powerup/bomberman/fire
+	name = "robustness up"
+	desc = "Makes your toolboxes stronger."
+	icon_state = "fireup"
+
+/obj/effect/powerup/bomberman/fire/trigger(mob/living/target)
+	. = ..()
+	if(!.)
+		return
+	for(var/obj/item/storage/toolbox/toolbox in target)
+		if(toolbox.force < 16)
+			toolbox.force++
+			toolbox.throwforce++
+			toolbox.transform = toolbox.transform.Scale(1.25, 1.25)
+
+/obj/effect/powerup/bomberman/bomb
+	name = "toolbox up"
+	desc = "Gives you another toolbox."
+	icon_state = "toolboxup"
+
+/obj/effect/powerup/bomberman/bomb/trigger(mob/living/target)
+	. = ..()
+	if(!.)
+		return
+	var/toolbox = new /obj/item/storage/toolbox(target.loc)
+	target.put_in_hands(toolbox)