diff --git a/backend/create_game.py b/backend/create_game.py
new file mode 100644
index 0000000..dce7f3b
--- /dev/null
+++ b/backend/create_game.py
@@ -0,0 +1,39 @@
+import boto3
+import json
+
+# assign DynamoDB table to modify
+table_name = "multiplayer-games"
+dynamo = boto3.resource('dynamodb')
+game_table = dynamo.Table(table_name)
+
+def lambda_handler(event, context):
+    ''' event should have the following fields:
+        - game_id: int,
+        - topic: string,
+        - questions: list of dicts
+        Adds the game to the game table. Returns an empty dictionary if success.
+    '''
+    try:
+        data = json.loads(event["body"])
+        game_id = data["game_id"]
+        topic = data["topic"]
+        questions = json.dumps(data["questions"])
+        
+        if game_id == 0:
+            return {
+                'statusCode': 400,
+                'body': json.dumps({'error': 'Game ID cannot be 0'})
+            }
+        
+        item = {"game_id": game_id, "topic": topic, "questions": questions, "players": "{}"}
+        game_table.put_item(Item=item)
+        
+        return {
+            'statusCode': 200,
+            'body': json.dumps({})
+        }
+    except Exception as e:
+        return {
+            'statusCode': 500,
+            'body': json.dumps({'message': str(e)})
+        }
\ No newline at end of file
diff --git a/backend/get_game.py b/backend/get_game.py
new file mode 100644
index 0000000..bffd0b8
--- /dev/null
+++ b/backend/get_game.py
@@ -0,0 +1,48 @@
+import boto3
+import json
+
+# assign DynamoDB table to modify
+table_name = "multiplayer-games"
+dynamo = boto3.resource('dynamodb')
+game_table = dynamo.Table(table_name)
+
+def lambda_handler(event, context):
+    ''' event should have the following fields:
+        - game_id: int
+        Returns (topic, questions, num_players). If the game is not found, return ('', [], -1).
+        
+    '''
+    try:
+        data = json.loads(event["body"])
+        game_id = data["game_id"]
+        
+        if game_id == 0:
+            return {
+                'statusCode': 400,
+                'body': json.dumps({'error': 'Game ID cannot be 0'})
+            }
+        
+        response = game_table.get_item(Key={"game_id": game_id})
+        if 'Item' not in response:
+            return {
+                'statusCode': 200,
+                'body': json.dumps({
+                    'topic': '',
+                    'questions': [],
+                    'num_players': -1
+                })
+            }
+        else:
+            return {
+                'statusCode': 200,
+                'body': json.dumps({
+                    'topic': response['Item']['topic'],
+                    'questions': json.loads(response['Item']['questions']),
+                    'num_players': len(json.loads(response['Item']['players']))
+                })
+            }
+    except Exception as e:
+        return {
+            'statusCode': 500,
+            'body': json.dumps({'message': str(e)})
+        }
\ No newline at end of file
diff --git a/backend/lambda_functions/add_player.py b/backend/lambda_functions/add_player.py
new file mode 100644
index 0000000..c2efd2a
--- /dev/null
+++ b/backend/lambda_functions/add_player.py
@@ -0,0 +1,56 @@
+import boto3
+import json
+
+
+table_name = "multiplayer-games"
+dynamo = boto3.resource('dynamodb')
+questions_table = dynamo.Table(table_name)
+
+
+def lambda_handler(event, context):
+    ''' [event] contains the following keys:
+        - game_id: id of game to add player results to
+        - score: score of player
+        - name: player name to display
+        Adds player and score to game players
+    '''
+    
+    try:
+        data = json.loads(event["body"])
+        id = data["game_id"]
+        score = data["score"]
+        name = data["name"]
+        
+        key = {'game_id': id}
+        response = questions_table.get_item(Key=key)
+        if 'Item' in response:
+            players = json.loads(response['Item']['players'])
+            
+            # add to players
+            if name in players:
+                players[name] = max(players[name], score)
+            else:
+                players[name] = score
+            
+
+            # update table
+            response = questions_table.update_item(
+                    Key=key,
+                    UpdateExpression="set players=:q",
+                    ExpressionAttributeValues={
+                        ':q': json.dumps(players)},
+                    ReturnValues="UPDATED_NEW")
+            return {
+                'statusCode': 200,
+                'body': json.dumps({})
+            }
+        else:
+            return {
+                'statusCode': 404,
+                'body': json.dumps({'error': "couldn't load players"})
+            }
+    except Exception as e:
+        return {
+            'statusCode': 500,
+            'body': json.dumps({'message': str(e)})
+        }
\ No newline at end of file
diff --git a/backend/lambda_functions/get_mcq_passage.py b/backend/lambda_functions/get_mcq_passage.py
new file mode 100644
index 0000000..957c19b
--- /dev/null
+++ b/backend/lambda_functions/get_mcq_passage.py
@@ -0,0 +1,81 @@
+import boto3
+import json
+import os
+import openai
+
+
+# assign DynamoDB table to modify
+table_name = "trivai-questions"
+dynamo = boto3.resource('dynamodb')
+questions_table = dynamo.Table(table_name)
+
+# constants
+OPENAI_API_KEY = os.environ["OPENAI_KEY"]
+MAX_QUESTIONS = 20
+
+
+# entry point for new events, parses event
+def lambda_handler(event, context):
+    ''' [event] contains the following keys:
+        - passage: passage to generate questions for
+        - num_questions:  number of questions to generate
+    '''
+
+    try:
+        data = json.loads(event["body"])
+        passage = data["passage"]
+        num_questions = data["num_questions"]
+
+        if num_questions > MAX_QUESTIONS:  # FIXME: cap instead of error?
+            return {
+                'statusCode': 400,
+                'body': json.dumps({"error": "Cannot generate more than %d questions at a time." % MAX_QUESTIONS})
+            }
+
+        status, res = mcq_passage(passage, num_questions)
+        if status == 200:
+            return {
+                'statusCode': 200,
+                'body': res
+            }
+    except Exception as e:
+        return {
+            'statusCode': 400,
+            'body': json.dumps({'error': e})
+        }
+
+
+def mcq_passage(passage, num_questions):
+    mcq_passage_prompt = """
+    Create %d questions about the following passage in exactly the following json format, which is surrounded in brackets. Make sure each question has exactly 4 answer choices. Do not output anything other than the questions in the specified format:
+    [
+        {
+            "question": question,
+            "options": [option 0, option 1, option 2, option 3],
+            "answer_id": answer_id
+        },
+        {
+            "question": question,
+            "options": [option 0, option 1, option 2, option 3],
+            "answer_id": answer_id
+        }, ...
+    ]
+    Passage: %s
+    """ % (num_questions, passage)
+    return get_chatgpt(mcq_passage_prompt)
+
+
+# get ChatGPT response to given prompt
+def get_chatgpt(prompt):  # (int, str)
+    completion = openai.ChatCompletion.create(
+        api_key=OPENAI_API_KEY,
+        model="gpt-3.5-turbo",
+        messages=[{"role": "user",
+                   "content": prompt}]
+    )
+    content = completion["choices"][0]["message"]["content"]  # str
+
+    try:
+        return 200, content
+    except:
+        return 400, json.dumps({"error": "OpenAI did not return a json string"})
diff --git a/backend/lambda_functions/get_mcq_topic.py b/backend/lambda_functions/get_mcq_topic.py
new file mode 100644
index 0000000..1f21598
--- /dev/null
+++ b/backend/lambda_functions/get_mcq_topic.py
@@ -0,0 +1,113 @@
+import boto3
+import json
+import os
+import openai
+import random
+
+
+# assign DynamoDB table to modify
+table_name = "trivai-questions"
+dynamo = boto3.resource('dynamodb')
+questions_table = dynamo.Table(table_name)
+
+# constants
+OPENAI_API_KEY = os.environ["OPENAI_KEY"]
+MAX_QUESTIONS = 20
+
+
+# entry point for new events, parses event
+def lambda_handler(event, context):
+    ''' [event] contains the following keys:
+        - topic: subject to generate questions for
+        - num_questions:  number of questions to generate
+    '''
+
+    try:
+        data = json.loads(event["body"])
+        topic = data["topic"]
+        num_questions = data["num_questions"]
+
+        if num_questions > MAX_QUESTIONS:  # FIXME: cap instead of error?
+            return {
+                'statusCode': 400,
+                'body': json.dumps({"error": "Cannot generate more than %d questions at a time." % MAX_QUESTIONS})
+            }
+
+        res = ""
+        key = {'topic_id': topic}
+        response = questions_table.get_item(Key=key)
+        if 'Item' in response:
+            # list of dictionaries
+            questions = json.loads(response['Item']['questions'])
+            if len(questions) < num_questions:
+                # Generate more questions and put the updated list of questions into the database
+                status, more_questions = mcq_topic(
+                    topic, num_questions - len(questions))
+                questions = questions + \
+                    json.loads(more_questions)  # list of dicts
+                response = questions_table.update_item(
+                    Key=key,
+                    UpdateExpression="set questions=:q",
+                    ExpressionAttributeValues={
+                        ':q': json.dumps(questions)},
+                    ReturnValues="UPDATED_NEW")
+            else:
+                # Randomly choose num_questions questions to return
+                questions = random.sample(questions, num_questions)
+            # return questions
+            return {
+                'statusCode': 200,
+                'body': json.dumps(questions)
+            }
+        else:
+            status, res = mcq_topic(topic, num_questions)
+            # store if not error
+            if status == 200:
+                item = {"topic_id": topic, "questions": res}
+                print(item)
+                questions_table.put_item(Item=item)
+                # return json.loads(res)
+                return {
+                    'statusCode': 200,
+                    'body': res
+                }
+    except Exception as e:
+        return {
+            'statusCode': 400,
+            'body': json.dumps({'error': e})
+        }
+
+
+def mcq_topic(topic, num_questions):  # (int, str)
+    mcq_topic_prompt = """
+    Create %d questions about %s in exactly the following json format, including the outer brackets:
+    [
+        {
+            "question": question,
+            "options": [option 0, option 1, option 2, option 3],
+            "answer_id": answer_id
+        },
+        {
+            "question": question,
+            "options": [option 0, option 1, option 2, option 3],
+            "answer_id": answer_id
+        }, ...
+    ]
+    """ % (num_questions, topic)
+    return get_chatgpt(mcq_topic_prompt)
+
+
+# get ChatGPT response to given prompt
+def get_chatgpt(prompt):  # (int, str)
+    completion = openai.ChatCompletion.create(
+        api_key=OPENAI_API_KEY,
+        model="gpt-3.5-turbo",
+        messages=[{"role": "user",
+                   "content": prompt}]
+    )
+    content = completion["choices"][0]["message"]["content"]  # str
+
+    try:
+        return 200, content
+    except:
+        return 400, json.dumps({"error": "OpenAI did not return a json string"})
diff --git a/backend/lambda_functions/get_results.py b/backend/lambda_functions/get_results.py
new file mode 100644
index 0000000..d693190
--- /dev/null
+++ b/backend/lambda_functions/get_results.py
@@ -0,0 +1,37 @@
+import boto3
+import json
+
+
+table_name = "multiplayer-games"
+dynamo = boto3.resource('dynamodb')
+questions_table = dynamo.Table(table_name)
+
+
+def lambda_handler(event, context):
+    ''' [event] contains the following keys:
+        - game_id: id of game to get results for
+        Returns all finished players for game game_id
+    '''
+    try:
+        data = json.loads(event["body"])
+        id = data["game_id"]
+        
+        key = {'game_id': id}
+        response = questions_table.get_item(Key=key)
+        if 'Item' in response:
+            players = json.loads(response['Item']['players'])
+            players = json.dumps(players)
+            return {
+                'statusCode': 200,
+                'body': players
+            }
+        else:
+            return {
+                'statusCode': 404,
+                'body': json.dumps({'error': "couldn't load players"})
+            }
+    except Exception as e:
+        return {
+            'statusCode': 500,
+            'body': json.dumps({'message': str(e)})
+        }
\ No newline at end of file
diff --git a/backend/lambda_functions/openai-layer.zip b/backend/lambda_functions/openai-layer.zip
new file mode 100644
index 0000000..78f3ba8
Binary files /dev/null and b/backend/lambda_functions/openai-layer.zip differ