diff --git a/card.h b/card.h
index 3c8beb0..d5198b9 100644
--- a/card.h
+++ b/card.h
@@ -12,6 +12,12 @@ typedef struct Hand Hand;
 #define CARD_HEIGHT 120
 #define CARD_BORDER 5
 
+#define CRANE_INDEX 0
+#define CURTAIN_INDEX 8
+#define MOON_INDEX 28
+#define RAINY_MAN_INDEX 40
+#define PHOENIX_INDEX 44
+
 typedef enum CardType {
   CHAFF,
   RIBBON,
diff --git a/field_multiplier.c b/field_multiplier.c
new file mode 100644
index 0000000..fca83f8
--- /dev/null
+++ b/field_multiplier.c
@@ -0,0 +1,17 @@
+#include <stdbool.h>
+
+#include "field_multiplier.h"
+#include "card.h"
+
+const FieldMultiplier *calculate_field_multiplier(Hand *h) {
+  bool large = false;
+  for (int i = 0; i < h->count; i++) {
+    Card *c = h->cards[i];
+    if (c->index == CRANE_INDEX || c->index == CURTAIN_INDEX || c->index == MOON_INDEX)
+      large = true;
+    else if (c->index == RAINY_MAN_INDEX || c->index == PHOENIX_INDEX)
+      return &grand_field;
+  }
+
+  return large ? &large_field : &small_field;
+}
diff --git a/field_multiplier.h b/field_multiplier.h
new file mode 100644
index 0000000..8b3e1f3
--- /dev/null
+++ b/field_multiplier.h
@@ -0,0 +1,19 @@
+#ifndef _HF_FIELD_MULTIPLIER_
+#define _HF_FIELD_MULTIPLIER_
+
+typedef struct FieldMultiplier FieldMultiplier;
+
+#include "card.h"
+
+struct FieldMultiplier {
+  char *name;
+  int value;
+};
+
+static const FieldMultiplier small_field = { "Small Field", 1 };
+static const FieldMultiplier large_field = { "Large Field", 2 };
+static const FieldMultiplier grand_field = { "Grand Field", 4 };
+
+const FieldMultiplier *calculate_field_multiplier(Hand *h);
+
+#endif
diff --git a/game.c b/game.c
index f0be7a3..02418ac 100644
--- a/game.c
+++ b/game.c
@@ -5,15 +5,19 @@
 #include "card.h"
 #include "teyaku.h"
 #include "dekiyaku.h"
+#include "field_multiplier.h"
 
 Vector2 mouse_pos;
 char teyaku_calculation[400];
-char dekiyaku_calculation[400];
 
 void initialize_game(Game *g) {
   g->deck.count = 0;
   g->should_close = false;
   g->state = GAME_STATE_INITIALIZING;
+  g->field_multiplier = NULL;
+  g->player_teyaku.calculated = false;
+  g->left_teyaku.calculated = false;
+  g->right_teyaku.calculated = false;
   for (int i = 0; i < 48; i++) {
     CardType t = CHAFF;
     RibbonType rt = RIBBON_NONE;
@@ -60,14 +64,15 @@ void initialize_game(Game *g) {
   shuffle_hand(&g->deck);
 
   g->player_hand.count = 0;
-  g->player_hand.position = (Vector2) { 20, 450 };
+  g->player_hand.position = (Vector2) { 20, 475 };
   g->right_hand.count = 0;
   g->right_hand.position = (Vector2) { 20, 100 };
   g->left_hand.count = 0;
-  g->left_hand.position = (Vector2) { 20, 250 };
+  g->left_hand.position = (Vector2) { 20, 225 };
+  g->field.count = 0;
+  g->field.position = (Vector2) { 20, 350 };
 
   strcpy(teyaku_calculation, "");
-  strcpy(dekiyaku_calculation, "");
 
   Image cards_image = LoadImage("img/cards.png");
   g->cards_texture = LoadTextureFromImage(cards_image);
@@ -107,9 +112,6 @@ void run_calculation(Game *g) {
       strcpy(teyaku_calculation, "");
     }
 
-    Dekiyaku d;
-    calculate_dekiyaku(h, &d);
-    dekiyaku_to_string(&d, dekiyaku_calculation);
     stale_calculation = false;
   }
 }
@@ -121,17 +123,31 @@ void run_frame_dealing(Game *g) {
     deal(&g->deck, &g->right_hand, 4, false);
   } else if (g->left_hand.count < 4) {
     deal(&g->deck, &g->left_hand, 4, false);
+  } else if (g->field.count < 3) {
+    deal(&g->deck, &g->field, 3, true);
   } else if (g->player_hand.count < 7) {
     deal(&g->deck, &g->player_hand, 3, true);
   } else if (g->right_hand.count < 7) {
     deal(&g->deck, &g->right_hand, 3, false);
   } else if (g->left_hand.count < 7) {
     deal(&g->deck, &g->left_hand, 3, false);
+  } else if (g->field.count < 6) {
+    deal(&g->deck, &g->field, 3, true);
   } else {
-    g->state = GAME_STATE_INITIALIZING;
+    g->state = GAME_STATE_CALCULATING_FIELD_MULTIPLIER;
   }
 }
 
+void run_frame_calculating_field_multiplier(Game *g) {
+  g->field_multiplier = calculate_field_multiplier(&g->field);
+  g->state = GAME_STATE_CALCULATING_TEYAKU;
+}
+
+void run_frame_calculating_teyaku(Game *g) {
+  calculate_teyaku(g->player_hand, &g->player_teyaku);
+  g->state = GAME_STATE_INITIALIZING;
+}
+
 void run_frame(Game *g) {
   float delta = GetFrameTime();
   bool done_moving = true;
@@ -149,6 +165,12 @@ void run_frame(Game *g) {
   case GAME_STATE_DEALING:
     run_frame_dealing(g);
     break;
+  case GAME_STATE_CALCULATING_FIELD_MULTIPLIER:
+    run_frame_calculating_field_multiplier(g);
+    break;
+  case GAME_STATE_CALCULATING_TEYAKU:
+    run_frame_calculating_teyaku(g);
+    break;
   }
   run_calculation(g);
 }
@@ -160,8 +182,12 @@ void draw_frame(Game *g) {
     draw_card(&g->cards[i], &g->cards_texture);
   }
 
-  DrawText(teyaku_calculation, 10, 550, 25, BLACK);
-  DrawText(dekiyaku_calculation, 10, 500, 25, BLACK);
+  if (g->field_multiplier) DrawText(g->field_multiplier->name, 600, 385, 40, BLACK);
+  if (g->player_teyaku.calculated) {
+    char s[200];
+    teyaku_to_string(&g->player_teyaku, s);
+    DrawText(s, 5, 25, 30, BLACK);
+  }
   EndDrawing();
 }
 
diff --git a/game.h b/game.h
index c04ceb3..c406708 100644
--- a/game.h
+++ b/game.h
@@ -6,10 +6,14 @@
 typedef struct Game Game;
 
 #include "card.h"
+#include "field_multiplier.h"
+#include "teyaku.h"
 
 typedef enum GameState {
   GAME_STATE_INITIALIZING,
-  GAME_STATE_DEALING
+  GAME_STATE_DEALING,
+  GAME_STATE_CALCULATING_FIELD_MULTIPLIER,
+  GAME_STATE_CALCULATING_TEYAKU,
 } GameState;
 
 struct Game {
@@ -17,7 +21,9 @@ struct Game {
   bool should_close;
   Card cards[48];
   Texture2D cards_texture;
-  Hand player_hand, left_hand, right_hand, deck;
+  Hand player_hand, left_hand, right_hand, deck, field;
+  FieldMultiplier *field_multiplier;
+  Teyaku player_teyaku, left_teyaku, right_teyaku;
 };
 
 void initialize_game(Game *g);
diff --git a/teyaku.c b/teyaku.c
index 8984b66..6a3373a 100644
--- a/teyaku.c
+++ b/teyaku.c
@@ -86,6 +86,7 @@ char *chaff_teyaku_english(ChaffTeyaku ct) {
 void calculate_teyaku(const Hand h, Teyaku *t) {
   t->chaff = calculate_chaff_teyaku(h);
   t->set = calculate_set_teyaku(h);
+  t->calculated = true;
 }
 
 void teyaku_to_string(Teyaku *t, char *str) {
diff --git a/teyaku.h b/teyaku.h
index 6e99abc..51d210e 100644
--- a/teyaku.h
+++ b/teyaku.h
@@ -1,6 +1,8 @@
 #ifndef _HF_TEYAKU_
 #define _HF_TEYAKU_
 
+#include <stdbool.h>
+
 #include "card.h"
 
 typedef enum SetTeyaku {
@@ -29,6 +31,7 @@ typedef enum ChaffTeyaku {
 typedef struct Teyaku {
   ChaffTeyaku chaff;
   SetTeyaku set;
+  bool calculated;
 } Teyaku;
 
 void calculate_teyaku(const Hand h, Teyaku *t);