diff --git a/gui/map_view.cpp b/gui/map_view.cpp
index 00306f7..0816a39 100644
--- a/gui/map_view.cpp
+++ b/gui/map_view.cpp
@@ -13,9 +13,8 @@
 #include <fstream>
 #include "palette.hpp"
 
-constexpr const int map_width=13;
-constexpr const int map_height=13;
-
+constexpr const int MAP_WIDTH=13;
+constexpr const int MAP_HEIGHT=13;
 
 namespace gui {
   using namespace components;
@@ -25,7 +24,8 @@ namespace gui {
     $level(level),
     $map_render(std::make_shared<sf::RenderTexture>()),
     $map_sprite($map_render->getTexture()),
-    $map_tiles(matrix::make(map_width, map_height))
+    $map_tiles(matrix::make(MAP_WIDTH, MAP_HEIGHT)),
+    $fow(matrix::make($level.map->width(), $level.map->height()))
   {
     auto player = $level.world->get_the<Player>();
     $player_display = $level.world->get<Tile>(player.entity).display;
@@ -33,6 +33,7 @@ namespace gui {
 
   void MapViewUI::update_level(GameLevel &level) {
     $level = level;
+    $fow = matrix::make($level.map->width(), $level.map->height());
   }
 
   void MapViewUI::init() {
@@ -44,7 +45,7 @@ namespace gui {
     $gui.set<Rectangle>($log_to, {10, THEME.DARK_MID, THEME.BORDER_COLOR, 10});
     $gui.set<Textual>($log_to, {L"Welcome to the Game!", 25, THEME.TEXT_COLOR, 10});
 
-    auto map_cell = lel::center(MAP_TILE_DIM * map_width, MAP_TILE_DIM * map_height, $gui.cell_for("map_grid"));
+    auto map_cell = lel::center(MAP_TILE_DIM * MAP_WIDTH, MAP_TILE_DIM * MAP_HEIGHT, $gui.cell_for("map_grid"));
     $map_sprite.setPosition({(float)map_cell.x, (float)map_cell.y + 30});
 
     $gui.init();
@@ -62,7 +63,17 @@ namespace gui {
   void MapViewUI::render(sf::RenderWindow &window, int compass_dir) {
     $gui.render(window);
 
-    System::draw_map($level, $map_tiles, $entity_map);
+    auto player = $level.world->get_the<components::Player>();
+    auto player_pos = $level.world->get<components::Position>(player.entity).location;
+
+    // NOTE: FoW is probably better done in the lighting system, because it illuminates where you've been.  The light calcs could then simply set the light the player touches to 1 when it's run.
+    for(matrix::circle it{$fow, player_pos, 2.5}; it.next();) {
+      for(int x = it.left; x < it.right; x++) {
+        $fow[it.y][x] = 1;
+      }
+    }
+
+    System::draw_map($level, $map_tiles, $fow, $entity_map);
     System::render_map($map_tiles, $entity_map, *$map_render, compass_dir, $player_display);
     $map_sprite.setTexture($map_render->getTexture(), true);
     window.draw($map_sprite);
diff --git a/gui/map_view.hpp b/gui/map_view.hpp
index b5d9836..8688c0a 100644
--- a/gui/map_view.hpp
+++ b/gui/map_view.hpp
@@ -17,6 +17,7 @@ namespace gui {
       std::shared_ptr<sf::RenderTexture> $map_render;
       sf::Sprite $map_sprite;
       matrix::Matrix $map_tiles;
+      matrix::Matrix $fow;
 
       MapViewUI(GameLevel &level);
       void init();
diff --git a/systems.cpp b/systems.cpp
index 268018e..f9f11ec 100644
--- a/systems.cpp
+++ b/systems.cpp
@@ -526,7 +526,7 @@ bool System::inventory_occupied(GameLevel& level, Entity container_id, const std
 }
 
 
-void System::draw_map(GameLevel& level, Matrix& grid, EntityGrid& entity_map) {
+void System::draw_map(GameLevel& level, Matrix& grid, Matrix& fow, EntityGrid& entity_map) {
   World &world = *level.world;
   Map &map = *level.map;
   size_t view_x = matrix::width(grid) - 1;
@@ -547,7 +547,7 @@ void System::draw_map(GameLevel& level, Matrix& grid, EntityGrid& entity_map) {
     size_t tile_y = size_t(it.y) + cam_orig.y;
     size_t tile_x = size_t(it.x) + cam_orig.x;
 
-    if(matrix::inbounds(tiles, tile_x, tile_y)) {
+    if(matrix::inbounds(tiles, tile_x, tile_y) && fow[tile_y][tile_x]) {
       size_t tid = tiles[tile_y][tile_x];
       grid[it.y][it.x] = tile_set[tid];
     } else {
@@ -558,11 +558,15 @@ void System::draw_map(GameLevel& level, Matrix& grid, EntityGrid& entity_map) {
   // then get the enemy/item/device tiles and fill those in
   world.query<Position, Tile>([&](auto, auto &pos, auto &entity_glyph) {
     // BUG: don't I have a within bounds macro somewhere?
-    if(pos.location.x >= cam_orig.x && pos.location.x <= cam_orig.x + view_x
-        && pos.location.y >= cam_orig.y && pos.location.y <= cam_orig.y + view_y)
+    if(pos.location.x >= cam_orig.x
+        && pos.location.x <= cam_orig.x + view_x
+        && pos.location.y >= cam_orig.y
+        && pos.location.y <= cam_orig.y + view_y)
     {
-      Point view_pos = map.map_to_camera(pos.location, cam_orig);
-      entity_map.insert_or_assign(view_pos, entity_glyph.display);
+        if(fow[pos.location.y][pos.location.x]) {
+          Point view_pos = map.map_to_camera(pos.location, cam_orig);
+          entity_map.insert_or_assign(view_pos, entity_glyph.display);
+        }
     }
   });
 }
diff --git a/systems.hpp b/systems.hpp
index 727d848..6fe0fc0 100644
--- a/systems.hpp
+++ b/systems.hpp
@@ -39,6 +39,6 @@ namespace System {
   void inventory_swap(GameLevel &level, Entity container_id, const std::string& a_name, const std::string &b_name);
   bool inventory_occupied(GameLevel& level, Entity container_id, const std::string& name);
 
-  void draw_map(GameLevel& level, Matrix& grid, EntityGrid& entity_map);
+  void draw_map(GameLevel& level, Matrix& grid, Matrix& fow, EntityGrid& entity_map);
   void render_map(Matrix& tiles, EntityGrid& entity_map, sf::RenderTexture& render, int compass_dir, wchar_t player_display);
 }
diff --git a/tests/map.cpp b/tests/map.cpp
index 9a1a463..5befe84 100644
--- a/tests/map.cpp
+++ b/tests/map.cpp
@@ -100,8 +100,11 @@ TEST_CASE("map image test", "[map-sprite]") {
   for(matrix::each_row it{level.map->walls()}; it.next();) {
     player_pos.location.x = it.x;
     player_pos.location.y = it.y;
+    size_t width = level.map->width();
+    size_t height = level.map->height();
 
-    System::draw_map(level, map_tiles, entity_map);
+    Matrix fow = matrix::make(width, height);
+    System::draw_map(level, map_tiles, fow, entity_map);
     System::render_map(map_tiles, entity_map, *render, 2, player_display);
 
 #ifdef TEST_RENDER