diff --git a/web/package.json b/web/package.json
index ad99518..3252b18 100644
--- a/web/package.json
+++ b/web/package.json
@@ -34,8 +34,10 @@
   "dependencies": {
     "@types/materialdb": "file:../materialdb",
     "materialdb": "file:../materialdb",
+    "monaco-editor": "^0.27.0",
     "reflect-metadata": "^0.1.13",
     "sequelize": "^6.6.5",
-    "sequelize-typescript": "^2.1.0"
+    "sequelize-typescript": "^2.1.0",
+    "ts-pattern": "^3.2.5"
   }
 }
diff --git a/web/src/hooks/index.ts b/web/src/hooks/index.ts
index 0486573..349fb2e 100644
--- a/web/src/hooks/index.ts
+++ b/web/src/hooks/index.ts
@@ -4,5 +4,6 @@ import { dbPromise } from "$lib/db";
 export async function handle({ request, resolve }) {
   request.locals.db = await dbPromise;
   request.locals.loginStatus = checkLogin(request);
+  console.log("DB", request.locals.db);
   return resolve(request);
 }
diff --git a/web/src/lib/MasteryDemo.svelte b/web/src/lib/MasteryDemo.svelte
index a68b2ae..e03f9ff 100644
--- a/web/src/lib/MasteryDemo.svelte
+++ b/web/src/lib/MasteryDemo.svelte
@@ -1,16 +1,16 @@
 <script lang="ts">
-  import MultipleChoice from "$lib/exercise/MultipleChoice.svelte";
+  import { onMount } from "svelte";
   import Exercise from "$lib/exercise/Exercise.svelte";
 
   let state = "loading";
   let exercise = null;
   
-  (async function() {
+  onMount(async () => {
     let resp = await fetch("/api/recommendExercise");
     let body = await resp.json();
     exercise = body.exercise;
     state = "finished";
-  })();
+  });
 </script>
 
 {#if state == "loading"}
diff --git a/web/src/lib/auth.ts b/web/src/lib/auth.ts
index 5e34853..9a31ce2 100644
--- a/web/src/lib/auth.ts
+++ b/web/src/lib/auth.ts
@@ -1,7 +1,16 @@
 import { User } from "$lib/db";
+import { match, select } from "ts-pattern";
+
+type _LoginStatus =
+  | { type: "loggedIn"; }
+  | { type: "notLoggedIn"; }
 
 export class LoginStatus {
-  constructor(public isLoggedIn: boolean, public username?: string) {}
+  constructor(
+    public isLoggedIn: boolean,
+    public user_id?: number,
+    public username?: string,
+  ) {}
 }
 
 export function checkLogin(req: Request): LoginStatus {
diff --git a/web/src/lib/components/Editor.svelte b/web/src/lib/components/Editor.svelte
new file mode 100644
index 0000000..6397069
--- /dev/null
+++ b/web/src/lib/components/Editor.svelte
@@ -0,0 +1,23 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import * as monaco from "monaco-editor/esm/vs/editor/editor.api";
+
+  export let language = "ocaml";
+  let editorElement;
+
+  onMount(() => {
+    let editor = monaco.editor.create(editorElement, {
+      language,
+    });
+    editor.layout();
+  });
+</script>
+
+<div bind:this={editorElement} class="editor" />
+
+<style lang="scss" scoped>
+  .editor {
+    width: 100%;
+    min-height: 400px;
+  }
+</style>
diff --git a/web/src/lib/db/exercise.ts b/web/src/lib/db/exercise.ts
new file mode 100644
index 0000000..7a22dc3
--- /dev/null
+++ b/web/src/lib/db/exercise.ts
@@ -0,0 +1,14 @@
+import { DataType, Unique, Column, Table, Model } from "sequelize-typescript";
+
+/// An instance of an exercise, created to be solved by a specific user.
+@Table
+export class ExerciseInstance extends Model {
+  @Column(DataType.STRING)
+  public user_id: string;
+
+  @Column(DataType.STRING)
+  public exercise_name: string;
+
+  @Column(DataType.JSON)
+  public instance_props: any;
+}
diff --git a/web/src/lib/db/index.ts b/web/src/lib/db/index.ts
index 2c5d4db..004878c 100644
--- a/web/src/lib/db/index.ts
+++ b/web/src/lib/db/index.ts
@@ -1,5 +1,6 @@
 import { Sequelize } from "sequelize-typescript";
 import { User } from "./user";
+import { ExerciseInstance } from "./exercise";
 
 import { Page, Exercise, Grader } from "materialdb/db";
 
@@ -15,7 +16,7 @@ async function loadMaterialDb() {
 
 async function init(): Promise<Sequelize> {
   let sequelize = new Sequelize(`sqlite:test.db`, {
-    models: [User],
+    models: [User, ExerciseInstance],
   });
   await sequelize.sync({ force: true });
   return sequelize;
@@ -24,4 +25,4 @@ async function init(): Promise<Sequelize> {
 export let dbPromise = init();
 export let materialDb = loadMaterialDb();
 
-export { User };
+export { User, ExerciseInstance };
diff --git a/web/src/lib/exercise/Exercise.svelte b/web/src/lib/exercise/Exercise.svelte
index 774e3a1..ad60b01 100644
--- a/web/src/lib/exercise/Exercise.svelte
+++ b/web/src/lib/exercise/Exercise.svelte
@@ -1,14 +1,22 @@
 <script lang="ts">
-  import MultipleChoice from "./MultipleChoice.svelte";
+  import MultipleChoice from "./MultipleChoice/Component.svelte";
+  import GradedProgram from "./GradedProgram/Component.svelte";
+  import { ExerciseStyle, ExerciseInfo } from "$lib/exercise";
 
-  export let exercise;
+  export let exercise: ExerciseInfo;
 </script>
 
-{JSON.stringify(exercise)}
-{exercise.style}
+<details open>
+  <summary>Exercise Spec</summary>
+  <pre>{JSON.stringify(exercise, null, 2)}</pre>
+</details>
 
 {#if !exercise}
   loading
-{:else if exercise.style == "multipleChoice"}
-  <MultipleChoice />
+{:else if exercise.style == ExerciseStyle.MultipleChoice}
+  <MultipleChoice props={exercise.props} />
+{:else if exercise.style == ExerciseStyle.GradedProgram}
+  <GradedProgram props={exercise.props} />
+{:else}
+  Sorry, no support for <code>{exercise.style}</code> type of questions yet!
 {/if}
diff --git a/web/src/lib/exercise/GradedProgram/Component.svelte b/web/src/lib/exercise/GradedProgram/Component.svelte
new file mode 100644
index 0000000..d495dba
--- /dev/null
+++ b/web/src/lib/exercise/GradedProgram/Component.svelte
@@ -0,0 +1,9 @@
+<script lang="ts">
+  import Editor from "$lib/components/Editor.svelte";
+
+  export let props;
+</script>
+
+<code>{props}</code>
+
+<Editor />
diff --git a/web/src/lib/exercise/GradedProgram/index.ts b/web/src/lib/exercise/GradedProgram/index.ts
new file mode 100644
index 0000000..e8dbb7f
--- /dev/null
+++ b/web/src/lib/exercise/GradedProgram/index.ts
@@ -0,0 +1,9 @@
+import { ExerciseStyle, IExercise } from "..";
+import Component from "./Component.svelte";
+
+let spec: IExercise = {
+  style: ExerciseStyle.GradedProgram,
+  component: Component,
+};
+
+export default spec;
diff --git a/web/src/lib/exercise/MultipleChoice.svelte b/web/src/lib/exercise/MultipleChoice/Component.svelte
similarity index 97%
rename from web/src/lib/exercise/MultipleChoice.svelte
rename to web/src/lib/exercise/MultipleChoice/Component.svelte
index e4d1c93..427149e 100644
--- a/web/src/lib/exercise/MultipleChoice.svelte
+++ b/web/src/lib/exercise/MultipleChoice/Component.svelte
@@ -1,4 +1,5 @@
 <script lang="ts">
+  export let props;
   export let question = {
     
     description: `
@@ -51,7 +52,7 @@
 
   <p>{ question.description }</p>
   <ul class="choices">
-    {#each question.choices as choice, index }
+    {#each props.choices as choice, index }
       <li>
         <input type="radio"
                name="choice"
diff --git a/web/src/lib/exercise/MultipleChoice/index.ts b/web/src/lib/exercise/MultipleChoice/index.ts
new file mode 100644
index 0000000..83fad4d
--- /dev/null
+++ b/web/src/lib/exercise/MultipleChoice/index.ts
@@ -0,0 +1,7 @@
+export class Props {
+
+}
+
+export class MaskedInfo {
+
+}
diff --git a/web/src/lib/exercise/createInstance.ts b/web/src/lib/exercise/createInstance.ts
new file mode 100644
index 0000000..4a2a346
--- /dev/null
+++ b/web/src/lib/exercise/createInstance.ts
@@ -0,0 +1,36 @@
+// mask the full exercise object to only the part that the client needs to see
+// in order to present it to the user (so the user can't just peek into network
+// transactions to see what the correct answer is)
+
+import type { Exercise } from "materialdb/db";
+import { ExerciseInstance } from "$lib/db";
+import type { LoginStatus } from "$lib/auth";
+import { ExerciseStyle } from ".";
+
+export class ExerciseInfo {
+  public style: string;
+  public props: any;
+}
+
+export async function createInstance(loginStatus: LoginStatus, exercise: Exercise): Promise<ExerciseInfo> {
+  let props;
+  switch (exercise.style) {
+    case ExerciseStyle.GradedProgram:
+      break;
+    case ExerciseStyle.MultipleChoice:
+      break;
+  }
+
+  let instance = new ExerciseInstance({
+    user_id: loginStatus.user_id,
+    exercise_name: exercise.name,
+    props,
+  });
+  instance.save();
+
+  let info = new ExerciseInfo();
+  info.style = exercise.style;
+  info.props = props;
+  console.log("info", info);
+  return info;
+}
diff --git a/web/src/lib/exercise/index.ts b/web/src/lib/exercise/index.ts
new file mode 100644
index 0000000..887ebbc
--- /dev/null
+++ b/web/src/lib/exercise/index.ts
@@ -0,0 +1,20 @@
+import { createInstance, ExerciseInfo } from "./createInstance";
+import type { SvelteComponentDev } from "svelte";
+
+export enum ExerciseStyle {
+  GradedProgram = "gradedProgram",
+  MultipleChoice = "multipleChoice",
+}
+
+export interface IExercise {
+  style: ExerciseStyle;
+  component: SvelteComponentDev;
+}
+
+export interface IExerciseProps {
+}
+
+export interface IExerciseMaskedInfo {
+}
+
+export { createInstance, ExerciseInfo };
diff --git a/web/src/lib/exercise/maskExercise.ts b/web/src/lib/exercise/maskExercise.ts
deleted file mode 100644
index 8b57c9f..0000000
--- a/web/src/lib/exercise/maskExercise.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-// mask the full exercise object to only the part that the client needs to see
-// in order to present it to the user (so the user can't just peek into network
-// transactions to see what the correct answer is)
-
-import type { Exercise } from "materialdb/db";
-
-export async function maskExercise(exercise: Exercise): Promise<any> {
-  return {};
-}
diff --git a/web/src/routes/api/recommendExercise.ts b/web/src/routes/api/recommendExercise.ts
index a1cf125..5e1fe8e 100644
--- a/web/src/routes/api/recommendExercise.ts
+++ b/web/src/routes/api/recommendExercise.ts
@@ -4,10 +4,13 @@
 
 import { Exercise } from "materialdb/db";
 import type { Sequelize } from "sequelize-typescript";
+import type { LoginStatus } from "$lib/auth";
+import { createInstance } from "$lib/exercise";
 
 export async function get(req) {
   let db: Sequelize = req.locals.db;
-  console.log("login Status:", req.locals.loginStatus);
+  let loginStatus: LoginStatus = req.locals.loginStatus;
+  console.log("login Status:", loginStatus);
 
   let exercise = await Exercise.findOne({
     where: {
@@ -17,7 +20,10 @@ export async function get(req) {
   });
   console.log("picked", exercise);
 
+  let instance = await createInstance(loginStatus, exercise);
+  console.log("instance", instance);
+
   return {
-    body: { exercise },
+    body: { exercise: instance },
   };
 }