diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95c8d2ee..1d7b0672 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,10 @@ Many thanks to the following for contributing to this release:
 
 ## Version 2.0.0-alpha.19
 
+### Major Features
+
+- Added support for 2.0 builtin mods during mod pack creation. [#684](https://github.com/clusterio/clusterio/pull/684).
+
 ### Features
 
 - Added Datastore and Datastore Provider classes to the library to support savable Maps [#629](https://github.com/clusterio/clusterio/pull/629).
diff --git a/packages/host/src/patch.ts b/packages/host/src/patch.ts
index c0047667..1221224e 100644
--- a/packages/host/src/patch.ts
+++ b/packages/host/src/patch.ts
@@ -202,12 +202,6 @@ export class PatchInfo {
 	}
 }
 
-
-const knownScenarios: Record<string, lib.ModuleInfo> = {
-	// First seen in 0.17.63
-	"4e866186ebe297f1038fd325b09df1a1f5e2fdd1": new lib.ModuleInfo("freeplay", "0.17.63", ["freeplay", "silo-script"]),
-};
-
 /**
  * Generates control.lua code for loading the Clusterio modules
  *
@@ -349,6 +343,14 @@ function reorderDependencies(modules: SaveModule[]) {
 	}
 }
 
+const knownScenarios: Record<string, lib.ModuleInfo> = {
+	// First seen in 0.17.63
+	"4e866186ebe297f1038fd325b09df1a1f5e2fdd1": new lib.ModuleInfo("freeplay", "0.17.63", [], ["scenario"]),
+	// First seen in 1.2.0 (aka 2.0) TODO Uncomment once clusterio lib supports 2.0
+	// The rest of the code has already been updated to support the new control.lua file for 2.0
+	// "bcbdde18ce4ec16ebfd93bd694cd9b12ef969c9a": new lib.ModuleInfo("freeplay", "1.2.0", [], ["scenario"]),
+};
+
 /**
  * Patch a save with the given modules
  *
@@ -387,6 +389,7 @@ export async function patch(savePath: string, modules: SaveModule[]) {
 
 		if (controlHash in knownScenarios) {
 			patchInfo = new PatchInfo(0, knownScenarios[controlHash], []);
+			root.file("scenario.lua", controlFile.nodeStream("nodebuffer"));
 		} else {
 			throw new Error(`Unable to patch save, unknown scenario (${controlHash})`);
 		}
diff --git a/packages/lib/src/data/ModPack.ts b/packages/lib/src/data/ModPack.ts
index 4ad3e00e..094a9248 100644
--- a/packages/lib/src/data/ModPack.ts
+++ b/packages/lib/src/data/ModPack.ts
@@ -395,7 +395,7 @@ export default class ModPack {
 		];
 
 		const integerVersion = integerFactorioVersion(factorioVersion);
-		if (integerVersion > integerFactorioVersion("1.2")) {
+		if (integerVersion >= integerFactorioVersion("1.2")) {
 			defaultMods = defaultMods.concat([
 				{ name: "elevated-rails", enabled: false, version: factorioVersion },
 				{ name: "quality", enabled: false, version: factorioVersion },
diff --git a/packages/web_ui/src/components/ModPackViewPage.tsx b/packages/web_ui/src/components/ModPackViewPage.tsx
index 21108611..d16819af 100644
--- a/packages/web_ui/src/components/ModPackViewPage.tsx
+++ b/packages/web_ui/src/components/ModPackViewPage.tsx
@@ -679,7 +679,10 @@ function applyModPackChanges(modPack: lib.ModPack, changes: ModChange[]) {
 	let modifiedModPack = modPack.shallowClone();
 	for (let change of changes) {
 		// Only modify fields that change to reduce re-renders
-		if (["mods.set", "mods.delete"].includes(change.type) && modifiedModPack.mods === modPack.mods) {
+		if (
+			["mods.set", "mods.delete", "factorioVersion"].includes(change.type)
+			&& modifiedModPack.mods === modPack.mods
+		) {
 			modifiedModPack.mods = new Map(modifiedModPack.mods);
 		}
 		if (
@@ -697,22 +700,30 @@ function applyModPackChanges(modPack: lib.ModPack, changes: ModChange[]) {
 			modifiedModPack.name = change.value;
 		} else if (change.type === "description") {
 			modifiedModPack.description = change.value;
-		} else if (change.type === "factorioVersion") {
-			modifiedModPack.factorioVersion = change.value;
 		} else if (change.type === "mods.set") {
-			if (change.name) {
-				modifiedModPack.mods.set(change.name, change.value as lib.ModRecord);
-			}
+			modifiedModPack.mods.set(change.name, change.value as lib.ModRecord);
 		} else if (change.type === "mods.delete") {
-			modifiedModPack.mods.delete(change.name!);
+			modifiedModPack.mods.delete(change.name);
 		} else if (change.type === "settings.set") {
-			if (change.name) {
-				modifiedModPack.settings[change.scope].set(change.name, change.value);
-			}
+			modifiedModPack.settings[change.scope].set(change.name, change.value);
 		} else if (change.type === "settings.delete") {
-			if (change.name) {
-				modifiedModPack.settings[change.scope].delete(change.name);
+			modifiedModPack.settings[change.scope].delete(change.name);
+		} else if (change.type === "factorioVersion") {
+			const newBuiltinMods = lib.ModPack.getBuiltinMods(change.value);
+			for (const newBuiltinMod of newBuiltinMods) {
+				const builtinMod = modifiedModPack.mods.get(newBuiltinMod.name);
+				if (builtinMod) { newBuiltinMod.enabled = builtinMod.enabled; }
+				modifiedModPack.mods.set(newBuiltinMod.name, newBuiltinMod);
 			}
+
+			const oldBuiltinMods = lib.ModPack.getBuiltinMods(modifiedModPack.factorioVersion);
+			for (const oldBuiltinMod of oldBuiltinMods) {
+				if (!newBuiltinMods.some(builtinMod => builtinMod.name === oldBuiltinMod.name)) {
+					modifiedModPack.mods.delete(oldBuiltinMod.name);
+				}
+			}
+
+			modifiedModPack.factorioVersion = change.value;
 		} else {
 			throw new Error(`Unknown change type ${change.type}`);
 		}
@@ -879,8 +890,9 @@ export default function ModPackViewPage() {
 						name="factorioVersion"
 						style={{ marginBottom: 0 }}
 						rules={[{
-							pattern: /^\d+\.\d+\.\d+?$/,
-							message: "Must be an a.b.c version number.",
+							required: true,
+							pattern: /^\d+\.\d+(\.\d+)?$/,
+							message: "Must be an a.b or a.b.c version number.",
 						}]}
 					>
 						<Input
@@ -895,7 +907,7 @@ export default function ModPackViewPage() {
 				onChange={pushChange}
 				onRevert={revertChange}
 				builtInMods={
-					lib.ModPack.getBuiltinMods(modPack.factorioVersion).map(builtinMod => builtinMod.name)
+					lib.ModPack.getBuiltinMods(modifiedModPack.factorioVersion).map(builtinMod => builtinMod.name)
 				}
 			/>
 			<SettingsTable
diff --git a/packages/web_ui/src/components/ModsPage.tsx b/packages/web_ui/src/components/ModsPage.tsx
index 6d30bed4..eeec0224 100644
--- a/packages/web_ui/src/components/ModsPage.tsx
+++ b/packages/web_ui/src/components/ModsPage.tsx
@@ -96,10 +96,11 @@ function CreateModPackButton() {
 					} catch {
 						return; // Validation failed
 					}
-					const modPack = lib.ModPack.fromJSON({} as any);
-					modPack.name = values.name;
-					modPack.factorioVersion = values.factorioVersion;
-					if (values.description) { modPack.description = values.description; }
+					const modPack = lib.ModPack.fromJSON({
+						name: values.name,
+						description: values.description,
+						factorio_version: values.factorioVersion,
+					} as any);
 					await control.send(new lib.ModPackCreateRequest(modPack));
 					navigate(`/mods/mod-packs/${modPack.id}/view`);
 				})().catch(notifyErrorHandler("Error creating mod pack"));