diff --git a/MultiversalDiplomacy/CommandLine/AdjudicateOptions.cs b/MultiversalDiplomacy/CommandLine/AdjudicateOptions.cs
index 67fca84..0bf1398 100644
--- a/MultiversalDiplomacy/CommandLine/AdjudicateOptions.cs
+++ b/MultiversalDiplomacy/CommandLine/AdjudicateOptions.cs
@@ -1,5 +1,9 @@
+using System.Text.Json;
+
 using CommandLine;
 
+using MultiversalDiplomacy.Model;
+
 namespace MultiversalDiplomacy.CommandLine;
 
 [Verb("adjudicate", HelpText = "Adjudicate a Multiversal Diplomacy game state.")]
@@ -10,6 +14,13 @@ public class AdjudicateOptions
 
     public static void Execute(AdjudicateOptions args)
     {
+        Stream input = args.InputFile switch {
+            null => Console.OpenStandardInput(),
+            "-" => Console.OpenStandardInput(),
+            _ => new FileStream(args.InputFile!, FileMode.Open, FileAccess.Read),
+        };
+        var state = JsonSerializer.Deserialize<World>(input);
+
         throw new NotImplementedException();
     }
 }
diff --git a/MultiversalDiplomacy/Script/IScriptHandler.cs b/MultiversalDiplomacy/Script/IScriptHandler.cs
new file mode 100644
index 0000000..20ef562
--- /dev/null
+++ b/MultiversalDiplomacy/Script/IScriptHandler.cs
@@ -0,0 +1,21 @@
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A handler that interprets and executes 5dp script commands. Script handlers may create additional script handlers
+/// and delegate handling to them, allowing a sort of recursive parsing of script commands.
+/// </summary>
+public interface IScriptHandler
+{
+    /// <summary>
+    /// When used interactively, the prompt that should be displayed.
+    /// </summary>
+    public string Prompt { get; }
+
+    /// <summary>
+    /// Process a line of input.
+    /// </summary>
+    /// <returns>
+    /// The handler that should handle the next line of input, or null if script handling should end.
+    /// </returns>
+    public IScriptHandler? HandleInput(string input);
+}
diff --git a/MultiversalDiplomacy/Script/ReplScriptHandler.cs b/MultiversalDiplomacy/Script/ReplScriptHandler.cs
new file mode 100644
index 0000000..475ef83
--- /dev/null
+++ b/MultiversalDiplomacy/Script/ReplScriptHandler.cs
@@ -0,0 +1,60 @@
+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A script handler for the interactive repl.
+/// </summary>
+public class ReplScriptHandler : IScriptHandler
+{
+    public string Prompt => "5dp> ";
+
+    public IScriptHandler? HandleInput(string input)
+    {
+        var args = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        if (args.Length == 0)
+        {
+            return this;
+        }
+
+        var command = args[0];
+        switch (command)
+        {
+            case "help":
+            case "?":
+                Console.WriteLine("Commands:");
+                Console.WriteLine("  help, ?: print this message");
+                Console.WriteLine("  stab: stab");
+                Console.WriteLine("  new: start a new game");
+                break;
+
+            case "stab":
+                Console.WriteLine("stab");
+                break;
+
+            case "new" when args.Length == 1:
+                Console.WriteLine("Usage:");
+                Console.WriteLine("  new [map]");
+                Console.WriteLine("Available maps:");
+		Console.WriteLine(string.Join(", ", Enum.GetNames<MapType>().Select(s => s.ToLowerInvariant())));
+                break;
+
+	    case "new" when args.Length > 1:
+                if (!Enum.TryParse<MapType>(args[1], out MapType map)) {
+		    Console.WriteLine($"Unknown map {args[1]}");
+		    Console.WriteLine("Available maps:");
+                    Console.WriteLine(string.Join(", ", Enum.GetNames<MapType>().Select(s => s.ToLowerInvariant())));
+		    break;
+		}
+		World world = World.WithMap(Map.FromType(map));
+		Console.WriteLine($"Created a new {map} game");
+		return this;
+
+            default:
+                Console.WriteLine($"Unrecognized command: {command}");
+                break;
+        }
+
+        return this;
+    }
+}