diff --git a/docs/api/games/Add game.bru b/docs/api/games/Add game.bru
index d7d2013..9791470 100644
--- a/docs/api/games/Add game.bru	
+++ b/docs/api/games/Add game.bru	
@@ -6,10 +6,17 @@ meta {
 
 post {
   url: {{base_url}}/api/user/games
-  body: none
+  body: json
   auth: inherit
 }
 
+body:json {
+  {
+    "steamAppId": 105600
+  }
+}
+
 settings {
   encodeUrl: true
+  timeout: 0
 }
diff --git a/main.go b/main.go
index 2779b5d..71f2a3e 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -267,8 +268,20 @@ func main() {
 			return
 		}
 
-		if tx := db.Create(game); tx.Error != nil {
-			sendError(w, "failed to create game", err, 400)
+		if tx := db.First(&model.Game{SteamAppID: game.SteamAppID}); tx.Error != nil {
+			// game doesn't exist in db, gonna create it real quick
+			if tx := db.Create(game); tx.Error != nil {
+				sendError(w, "failed to create game", err, 400)
+				return
+			}
+		}
+
+		alreadyHasGame := !slices.ContainsFunc(user.Games, func(g model.Game) bool {
+			return g.SteamAppID == game.SteamAppID
+		})
+		if !alreadyHasGame {
+			// user already has this game on the wishlist
+			sendError(w, "game is already on the wishlist", nil, 400)
 			return
 		}
 
diff --git a/model/game.go b/model/game.go
index 405f5e4..8a594ae 100644
--- a/model/game.go
+++ b/model/game.go
@@ -4,7 +4,7 @@ type Game struct {
 	Model
 
 	Name        string `json:"name"`
-	SteamAppID  int    `json:"steamAppId"`
+	SteamAppID  int    `json:"steamAppId" gorm:"unique"`
 	Image       string `json:"image"`
 	ReleaseDate string `json:"releaseDate"`
 }