diff --git a/src/Unluau.CLI/Program.cs b/src/Unluau.CLI/Program.cs
index fbd5140..d91bbaf 100644
--- a/src/Unluau.CLI/Program.cs
+++ b/src/Unluau.CLI/Program.cs
@@ -7,7 +7,7 @@ internal class Program
     {
         static void Main(string[] args)
         {
-            using var stream = File.OpenRead("./test/input.txt");
+            using var stream = File.OpenRead("./test/Unary.luau");
             var chunk = LuauChunk.Create(stream);
 
             Console.WriteLine(chunk.ToString());
diff --git a/src/Unluau/Chunk/Luau/Function.cs b/src/Unluau/Chunk/Luau/Function.cs
index b51fa9f..0825571 100644
--- a/src/Unluau/Chunk/Luau/Function.cs
+++ b/src/Unluau/Chunk/Luau/Function.cs
@@ -526,6 +526,35 @@ OpCode.LOADKX or
                         block.Statements.Add(new Move(context, ra, rb));
                         break;
                     }
+                    case OpCode.CONCAT:
+                    {
+                        var values = new Reference[instruction.C - instruction.B + 1];
+
+                        for ( var i = instruction.B; i < instruction.C + 1; ++i )
+                        {
+                            values[i - instruction.B] = new Reference(context, stack.Get(i)!);
+                        }
+
+                        stack.Set(instruction.A, new Concat(context, values));
+
+                        break;
+                    }
+                    case OpCode.LENGTH:
+                    case OpCode.MINUS:
+                    case OpCode.NOT:
+                    {
+                        var type = instruction.Code switch
+                        {
+                            OpCode.LENGTH => UnaryType.Length,
+                            OpCode.MINUS => UnaryType.Minus,
+                            OpCode.NOT => UnaryType.Not,
+                            _ => throw new NotSupportedException()
+                        };
+
+                        stack.Set(instruction.A, new Unary(context, type, new Reference(context, stack.Get(instruction.B)!)));
+
+                        break;
+                    }
                     case OpCode.JUMPIFEQ:
                     case OpCode.JUMPIFLE:
                     case OpCode.JUMPIFLT:
diff --git a/src/Unluau/IL/Values/Concat.cs b/src/Unluau/IL/Values/Concat.cs
new file mode 100644
index 0000000..5051875
--- /dev/null
+++ b/src/Unluau/IL/Values/Concat.cs
@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Unluau.Utils;
+
+namespace Unluau.IL.Values
+{
+    /// <summary>
+    /// Concatenates values in registers.
+    /// </summary>
+    /// <param name="context">Information about the location.</param>
+    /// <param name="registers">The registers that are concatenated together.</param>
+    public class Concat(Context context, BasicValue[] registers) : BasicValue(context)
+    {
+        /// <summary>
+        /// The registers that are concatenated together.
+        /// </summary>
+        public BasicValue[] Registers { get; set; } = registers;
+
+        /// <summary>
+        /// Implements the visitor.
+        /// </summary>
+        /// <param name="visitor">The visitor.</param>
+        public override void Visit(Visitor visitor)
+        {
+            if (visitor.Visit(this))
+            {
+                foreach (var reg in Registers)
+                {
+                    reg.Visit(visitor);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Converts the current <see cref="Concat"/> to a string.
+        /// </summary>
+        /// <returns>String representation.</returns>
+        public override string ToString() => $"Concat({TypeExtensions.ToString(Registers)})";
+    }
+}
diff --git a/src/Unluau/IL/Values/Unary.cs b/src/Unluau/IL/Values/Unary.cs
new file mode 100644
index 0000000..56263a9
--- /dev/null
+++ b/src/Unluau/IL/Values/Unary.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Unluau.Utils;
+
+namespace Unluau.IL.Values
+{
+    public enum UnaryType
+    { 
+        Not,
+        Minus,
+        Length
+    }
+
+    /// <summary>
+    /// Applies unary operation to a register.
+    /// </summary>
+    /// <param name="context">Information about the location.</param>
+    /// <param name="type">The type of unary operation.</param>
+    /// <param name="value">The register that the unary operation is applied to.</param>
+    public class Unary(Context context, UnaryType type, BasicValue value) : BasicValue(context)
+    {
+        /// <summary>
+        /// The type of unary operation.
+        /// </summary>
+        public UnaryType Type { get; set; } = type;
+
+        /// <summary>
+        /// The register that the unary operation is applied to.
+        /// </summary>
+        public BasicValue Value { get; set; } = value;
+
+        /// <summary>
+        /// Implements the visitor.
+        /// </summary>
+        /// <param name="visitor">The visitor.</param>
+        public override void Visit(Visitor visitor)
+        {
+            if (visitor.Visit(this))
+            {
+                Value.Visit(visitor);
+            }
+        }
+
+        /// <summary>
+        /// Converts the current <see cref="Unary"/> to a string.
+        /// </summary>
+        /// <returns>String representation.</returns>
+        public override string ToString() => $"{Enum.GetName(typeof(UnaryType), Type)}({TypeExtensions.ToString(Value)})";
+    }
+}
diff --git a/src/Unluau/IL/Visitors/ValueVisitor.cs b/src/Unluau/IL/Visitors/ValueVisitor.cs
index 4a8c953..9b39100 100644
--- a/src/Unluau/IL/Visitors/ValueVisitor.cs
+++ b/src/Unluau/IL/Visitors/ValueVisitor.cs
@@ -167,6 +167,12 @@ private static BasicValue ResolveValue(BasicValue value)
             if (value is Table table)
                 ResolveTable(table);
 
+            if (value is Concat concat)
+                concat.Registers = ResolveValueList(concat.Registers);
+
+            if (value is Unary unary)
+                unary.Value = ResolveValue(unary.Value);
+
             return value;
         }