diff --git a/src/api/types/GameDef.ts b/src/api/types/GameDef.ts
index 7c7f2a6..d51eec2 100644
--- a/src/api/types/GameDef.ts
+++ b/src/api/types/GameDef.ts
@@ -1,10 +1,26 @@
 export interface GameDef {
-    title: string;
-    playerSizes: number[];
-    bgColor?: string;
-    fontColor?: string;
-    primaryColor?: string;
-    secondaryColor?: string;
-    fontFamily?: string;
-    winMode?: string;
+    title: string; // The name of the game
+    playerSizes: number[]; // An array of all possible player counts
+    rows: RowDef[]; // An array of rows
+    bgColor?: string; // The background color to be used
+    fontColor?: string; // The font color to be used
+    primaryColor?: string; // The primary color to be used
+    secondaryColor?: string; // The secondary color to be used
+    stripeColor?: string; // The color of the stripes
+    fontFamily?: string; // The font family to be used
+    winMode?: string; // The winnning mode
+    extensions?: { [name: string]: ExtensionDef }; // Specify Extensions
+    roundMapper?: { [playerCount: number]: number }; // A mapping of player count to round count
+}
+
+export interface RowDef {
+    name: string; // The name of the row
+    icon?: string; // The icon to be displayed for the row
+    description?: string; // The description of the row
+    bgColor?: string; // The background color to be used only for this row
+    negative?: boolean; // Whether this row is negative
+}
+
+export interface ExtensionDef {
+    rows: RowDef[]; // The rows to add for this extension
 }