diff --git a/gui.cpp b/gui.cpp
index c89b38b..7fec19a 100644
--- a/gui.cpp
+++ b/gui.cpp
@@ -54,22 +54,11 @@ GUI::GUI() :
   $game_map(GAME_MAP_X, GAME_MAP_Y),
   $window(sf::VideoMode(VIDEO_X,VIDEO_Y), "Roguish"),
   $screen(SCREEN_X, SCREEN_Y),
-  $map_screen(0,0)
+  $map_screen(0,0),
+  $map_font_size(BASE_MAP_FONT_SIZE)
 {
   $font.loadFromFile("./assets/text.otf");
-  // calculate display size
-  sf::Glyph base_glyph = $font.getGlyph(L'█', MAP_FONT_SIZE, false);
-  auto bounds = base_glyph.bounds;
-  $view_port = {
-    size_t(std::ceil((VIDEO_X - GAME_MAP_POS) / bounds.width)),
-    size_t(std::ceil(VIDEO_Y / bounds.height))
-  };
-
-  // set canvas to best size
-  $canvas = Canvas($view_port.x * 2, $view_port.y * 4);
-
-  $map_screen = Screen($view_port.x, $view_port.y);
-
+  resize_map(BASE_MAP_FONT_SIZE);
   int res = $hit_buf.loadFromFile("./assets/hit.wav");
   dbc::check(res, "failed to load hit.wav");
   $hit_sound.setBuffer($hit_buf);
@@ -128,6 +117,10 @@ bool GUI::handle_events() {
       } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Down)) {
         player_motion.dy = 1;
         event_happened = true;
+      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Equal)) {
+        resize_map($map_font_size + 10);
+      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Hyphen)) {
+        resize_map($map_font_size - 10);
       }
     }
   }
@@ -138,11 +131,12 @@ bool GUI::handle_events() {
 
 sf::Sprite &GUI::get_text_sprite(wchar_t tile) {
   if(!$sprites.contains(tile)) {
-    sf::Glyph glyph = $font.getGlyph(tile, MAP_FONT_SIZE, false);
+    $sprites.clear();
+    sf::Glyph glyph = $font.getGlyph(tile, $map_font_size, false);
     // WARNING! we actually have to do this here because SFML caches
     // the glyphs on the font texture, so this gets loaded each time
     // we get a new glyph from the font.
-    $font_texture = $font.getTexture(MAP_FONT_SIZE);
+    $font_texture = $font.getTexture($map_font_size);
     sf::Sprite sprite($font_texture);
     sprite.setTextureRect(glyph.textureRect);
     $sprites[tile] = sprite;
@@ -158,6 +152,21 @@ void GUI::run_systems() {
   System::combat($world, player);
 }
 
+void GUI::resize_map(int new_size) {
+  if(MIN_FONT_SIZE < new_size && new_size < MAX_FONT_SIZE) {
+    $map_font_size = new_size;
+    sf::Glyph base_glyph = $font.getGlyph(L'█', $map_font_size, false);
+    auto bounds = base_glyph.bounds;
+    $view_port = {
+      size_t(std::ceil((VIDEO_X - GAME_MAP_POS) / bounds.width)),
+      size_t(std::ceil(VIDEO_Y / bounds.height))
+    };
+    // set canvas to best size
+    $canvas = Canvas($view_port.x * 2, $view_port.y * 4);
+    $map_screen = Screen($view_port.x, $view_port.y);
+  }
+}
+
 void GUI::draw_screen(bool clear, float map_off_x, float map_off_y) {
   if(clear) $window.clear();
   std::string screenout = $screen.ToString();
@@ -170,8 +179,8 @@ void GUI::draw_screen(bool clear, float map_off_x, float map_off_y) {
 
   float y = 0.0f;
   float x = GAME_MAP_POS;
-  const float line_spacing = $font.getLineSpacing(MAP_FONT_SIZE);
-  sf::Glyph base_glyph = $font.getGlyph(L'█', MAP_FONT_SIZE, false);
+  const float line_spacing = $font.getLineSpacing($map_font_size);
+  sf::Glyph base_glyph = $font.getGlyph(L'█', $map_font_size, false);
   auto bg_sprite = get_text_sprite(L'█');
   bg_sprite.setColor(sf::Color(20,20,20));
   auto add_sprite = get_text_sprite(L'!');
diff --git a/gui.hpp b/gui.hpp
index 2d037f4..1e77333 100644
--- a/gui.hpp
+++ b/gui.hpp
@@ -17,6 +17,8 @@
 using std::string;
 using ftxui::Canvas, ftxui::Component, ftxui::Screen;
 
+constexpr int MIN_FONT_SIZE = 20;
+constexpr int MAX_FONT_SIZE = 140;
 constexpr int GAME_MAP_X = 90;
 constexpr int GAME_MAP_Y = 90;
 constexpr int GAME_MAP_POS = 600;
@@ -24,8 +26,8 @@ constexpr int SCREEN_X = 40;
 constexpr int SCREEN_Y = 30;
 constexpr int VIDEO_X = 1600;
 constexpr int VIDEO_Y = 900;
-constexpr int MAP_FONT_SIZE=90;
 constexpr int UI_FONT_SIZE=30;
+constexpr int BASE_MAP_FONT_SIZE=90;
 
 enum class Value {
   BLACK=0, DARK_DARK, DARK_MID,
@@ -51,6 +53,7 @@ class GUI {
   sf::Texture $font_texture;
   std::unordered_map<wchar_t, sf::Sprite> $sprites;
   Point $view_port = {0,0};
+  int $map_font_size;
 
 public:
   GUI();
@@ -66,6 +69,7 @@ public:
   void shake();
   void configure_world();
   void run_systems();
+  void resize_map(int new_size);
   sf::Sprite &get_text_sprite(wchar_t tile);
 
   int main();