diff --git a/src/components/App/App.js b/src/components/App/App.js
index ce74e83..fa5b0e6 100644
--- a/src/components/App/App.js
+++ b/src/components/App/App.js
@@ -2,10 +2,11 @@ import React, {useRef, useEffect, useState} from 'react';
 import ReactMarkdown from 'react-markdown'
 import styles from './App.module.css';
 
-function App({onCommand, messages, game}) {
+function App({onCommand, game}) {
   const inputRef = useRef()
   const playAreaRef = useRef()
   const [state, setState] = useState({})
+  const messages = state.messages || []
 
   function onSubmit(ev) {
     if(ev) ev.preventDefault();
@@ -84,5 +85,8 @@ function jsonReplacer(key, value) {
       return obj;
     }, {});
 
+  if(key === 'messages' && Array.isArray(value) && value.length)
+    return ['...']
+
   return value
 }
diff --git a/src/components/App/App.module.css b/src/components/App/App.module.css
index 47da986..2a2ca8d 100644
--- a/src/components/App/App.module.css
+++ b/src/components/App/App.module.css
@@ -48,6 +48,8 @@
 .infoArea {
   width: 300px;
   overflow-x: hidden;
+  overflow-y: scroll;
+  max-height: 100vh;
 }
 
 .command {
diff --git a/src/engine/Game.ts b/src/engine/Game.ts
index 03a4a2e..bf618b9 100644
--- a/src/engine/Game.ts
+++ b/src/engine/Game.ts
@@ -1,6 +1,7 @@
 import {enableMapSet, createDraft, finishDraft, Draft} from 'immer'
 import GameState, { GameObject, Room, Door, Item, ObjectType } from './types/GameState'
-import ParsedCommand, { TokenType, ParsedTokenExpression, ValidCommandDetails, InvalidCommandDetails } from './types/ParsedCommand'
+import ParsedCommand, { ValidCommandDetails, InvalidCommandDetails } from './types/ParsedCommand'
+import { GameEventMessage, GameEventCommand } from './types/GameEvent'
 
 enableMapSet()
 
@@ -13,7 +14,15 @@ export type CommandValidateResult = {
 }
 
 export default class Game {
-  private gameState : GameState = {directions: new Map(), rooms: new Map(), doors: new Map(), items: new Map(), player: {location: ''}}
+  private gameState : GameState = {
+    directions: new Map(),
+    rooms: new Map(),
+    doors: new Map(),
+    items: new Map(),
+    player: {location: ''},
+    messages: []
+  }
+
   private draft : Draft<GameState> | null = null
   private onChangeListeners : ChangeListener [] = []
 
@@ -29,6 +38,16 @@ export default class Game {
     this.saveDraft()
   }
 
+  outputCommand(commandString: string) {
+    const state = this.getState()
+    state.messages.push(new GameEventCommand(commandString))
+  }
+
+  say(message: string) {
+    const state = this.getState()
+    state.messages.push(new GameEventMessage(message))
+  }
+
   filterValidCommands(commands: ParsedCommand[]) : CommandValidateResult {
     let validCommands : ValidCommandDetails[] = []
     let invalidCommands : InvalidCommandDetails[] = []
@@ -43,7 +62,12 @@ export default class Game {
       }
     }
 
-    invalidCommands.sort((a,b) => a.severity - b.severity)
+    invalidCommands.sort((a,b) => {
+      if(a.severity !== b.severity)
+        return a.severity - b.severity
+
+      return b.command.getNumTokens() - a.command.getNumTokens()
+    })
 
     return {validCommands, invalidCommands}
   }
@@ -104,15 +128,15 @@ export default class Game {
       case ObjectType.Door:
         collection = this.getState().doors
         break
-        
+
       case ObjectType.Item:
         collection = this.getState().items
         break
-      
+
       case ObjectType.Room:
         collection = this.getState().rooms
         break
-    
+
       case ObjectType.Direction:
         collection = this.getState().directions
         break
@@ -123,7 +147,7 @@ export default class Game {
     const exactMatch = objects.find((object) => name === object.name)
     if(exactMatch)
       return exactMatch
-    
+
     const aliasMatch = objects.find(({aliases}) => aliases.includes(name))
     if(aliasMatch)
       return aliasMatch
diff --git a/src/engine/Parser.ts b/src/engine/Parser.ts
index bcdb365..57a1369 100644
--- a/src/engine/Parser.ts
+++ b/src/engine/Parser.ts
@@ -1,6 +1,6 @@
 import Game from "./Game";
 import RulesEngine from './RulesEngine'
-import ParsedCommand from "./types/ParsedCommand";
+import ParsedCommand, { InvalidCommandDetails } from "./types/ParsedCommand";
 import Verb from './types/Verb';
 
 export default class Parser {
@@ -14,6 +14,8 @@ export default class Parser {
   }
 
   handleCommand(rawCommand : string) {
+    this.game.outputCommand(rawCommand)
+
     // Parse command for syntactical validity
     // (according to known verb templates)
     const grammaticalParsings : ParsedCommand[] = this.parseCommandString(rawCommand)
@@ -21,6 +23,15 @@ export default class Parser {
     // Ask the game state container to filter commands for object validity
     // (nouns refer to valid objects, all objects are visible, etc)
     const validationResult = this.game.filterValidCommands(grammaticalParsings)
+
+    if(validationResult.validCommands.length < 1) {
+      this.handleError(validationResult.invalidCommands)
+    } else {
+      // TODO: Do the thing
+    }
+
+    this.game.saveDraft()
+
     console.log(validationResult)
   }
 
@@ -35,6 +46,25 @@ export default class Parser {
     return parsings
   }
 
+  handleError(invalidCommands: InvalidCommandDetails []) {
+    console.log(invalidCommands)
+
+    if(!invalidCommands.length){
+      this.game.say("I'm unsure what you're trying to do")
+      return
+    }
+
+    const mostValid = invalidCommands[0]
+
+    if(mostValid.command.verb.name === 'go'){
+      this.game.say("I'm unsure what you're trying to do")
+      return
+    }
+
+    this.game.say(mostValid.reason)
+    console.log(mostValid)
+  }
+
   understand(name : string) : VerbBuilder {
     const verb = new Verb(name)
     this.verbs.push(verb)
diff --git a/src/engine/Renderer.tsx b/src/engine/Renderer.tsx
index 70ddc45..bdd4583 100644
--- a/src/engine/Renderer.tsx
+++ b/src/engine/Renderer.tsx
@@ -32,7 +32,7 @@ export default class Renderer {
   private render() {
     ReactDOM.render(
       <React.StrictMode>
-        <App messages={this.output} game={this.game} onCommand={this.handleCommand.bind(this)}/>
+        <App game={this.game} onCommand={this.handleCommand.bind(this)}/>
       </React.StrictMode>,
       document.getElementById('root')
     )
diff --git a/src/engine/types/GameEvent.ts b/src/engine/types/GameEvent.ts
index 680ce91..55221e2 100644
--- a/src/engine/types/GameEvent.ts
+++ b/src/engine/types/GameEvent.ts
@@ -3,24 +3,28 @@ export enum GameEventType {
   Command = 'command'
 }
 
-export default interface GameEvent {
-  getType() : GameEventType;
+export default class GameEvent {
+  readonly type : GameEventType
+
+  constructor(type : GameEventType) {
+    this.type = type
+  }
 }
 
-export class GameEventMessage implements GameEvent {
-  private message : string
+export class GameEventMessage extends GameEvent {
+  readonly message : string
 
-  getType() : GameEventType { return GameEventType.Message }
   constructor(message : string) {
+    super(GameEventType.Message)
     this.message = message
   }
 }
 
-export class GameEventCommand implements GameEvent {
-  private rawCommand : string
+export class GameEventCommand extends GameEvent {
+  readonly command : string
 
-  getType() : GameEventType { return GameEventType.Command }
-  constructor(rawCommand : string) {
-    this.rawCommand = rawCommand
+  constructor(command : string) {
+    super(GameEventType.Command)
+    this.command = command
   }
 }
diff --git a/src/engine/types/GameState.ts b/src/engine/types/GameState.ts
index 4968dec..867d820 100644
--- a/src/engine/types/GameState.ts
+++ b/src/engine/types/GameState.ts
@@ -1,3 +1,5 @@
+import GameEvent from './GameEvent'
+
 type GameState = {
   readonly directions: Map<ObjectID, Direction>,
   readonly rooms: Map<ObjectID, Room>,
@@ -6,6 +8,7 @@ type GameState = {
   readonly player: {
     readonly location: ObjectID
   }
+  readonly messages: GameEvent []
 }
 
 export default GameState
diff --git a/src/engine/types/ParsedCommand.ts b/src/engine/types/ParsedCommand.ts
index d9480ce..b462618 100644
--- a/src/engine/types/ParsedCommand.ts
+++ b/src/engine/types/ParsedCommand.ts
@@ -54,6 +54,10 @@ export default class ParsedCommand {
     this.verb = verb
   }
 
+  getNumTokens() : number {
+    return this.tokens.length
+  }
+
   prepend(token : ParsedToken) {
     const newCommand = new ParsedCommand(this.verb)
     newCommand.tokens = [token, ...this.tokens]
@@ -65,7 +69,7 @@ export default class ParsedCommand {
 
     let subject : GameObject | null = null
     let object : GameObject | null = null
-    
+
     for(const noun of nouns) {
       let gameObject = game.findObjectByName(noun.name, noun.itemType)
       if(!gameObject)
@@ -76,11 +80,14 @@ export default class ParsedCommand {
           severity: ParsingErrorSeverity.NoSuchObject
         }
 
+      // TODO: Optionally print "the" depending on if the original
+      // command name had one at the beginning (don't print the the book)
+      // (but also don't do "you cannot see heart of the cards")
       if(!game.isVisible(gameObject))
         return {
           isValid: false,
           command: this,
-          reason: `You cannot see ${noun.name}`,
+          reason: `You cannot see the ${noun.name}`,
           severity: ParsingErrorSeverity.NotVisible
         }
 
diff --git a/src/index.tsx b/src/index.tsx
index 7e71a29..68bd57b 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -86,6 +86,13 @@ game.addItem({
   location: 'entry'
 })
 
+game.addItem({
+  type: ObjectType.Item,
+  name: 'ruby',
+  aliases: ['gem'],
+  location: 'office'
+})
+
 game.getState().player.location = 'entry'
 
 game.saveDraft()