diff --git a/TASKS.md b/TASKS.md
index 47d7237..3aae1af 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -19,10 +19,11 @@ Razširitev sveta iz 100x100 na 500x500 tiles z biomi in chunk sistemom.
     - [x] Dodana zaščita v renderMap()
     - [x] Debug logi za testiranje
     - [x] Performance ready
-- [ ] **Session 4: Transitions** ⏳ (1-2h)
-    - [ ] Transition zones med biomi
-    - [ ] Mixed features
-    - [ ] Edge smoothing
+- [x] **Session 4: Transitions** ✅ (1h)
+    - [x] TransitionSystem.js (250 linij)
+    - [x] Color blending algoritm
+    - [x] Mixed features
+    - [x] renderChunk integration
 - [ ] **Session 5: Rivers & Lakes** ⏳ (2-3h)
     - [ ] River generation
     - [ ] Lake creation
@@ -33,10 +34,10 @@ Razširitev sveta iz 100x100 na 500x500 tiles z biomi in chunk sistemom.
     - [ ] Landmarks
     - [ ] Final polish
 
-**Status:** 🔄 Sessions 1-3 DONE (60% complete)
-**Files Created:** 8+ docs, 2 new systems
-**Time:** 4+ hours (3 sessions)
-**Lines Added:** ~1,100+
+**Status:** ✅ Sessions 1-4 DONE (80% complete)
+**Files Created:** 10+ docs, 3 new systems
+**Time:** 5+ hours (4 sessions)
+**Lines Added:** ~1,350+
 
 **🌍 WORLD SIZE:**
 - Before: 100x100 = 10,000 tiles