diff --git a/README.md b/README.md
index 566a1cb..9cc02ce 100644
--- a/README.md
+++ b/README.md
@@ -17,15 +17,16 @@ npm i polkadot-launch -g
 ## Binary Files
 
 To use polkadot-launch, you need to have binary files for a `polkadot` relay chain and a
-`polkadot-collator`.
+`polkadot-collator` in the bin folder.
 
-You can generate these files by cloning the `rococo-v1` branch of these projects and building them
-with the specific flags below:
+You can generate these files by cloning the `rococo-v1` branch of these projects in the same root as the polkadot-launch repo
+and building them with the specific flags below:
 
 ```bash
 git clone https://github.com/paritytech/polkadot
 cd polkadot
 cargo build --release
+cp ./target/release/polkadot ../polkadot-launch/bin/polkadot-relaychain
 ```
 
 and
@@ -34,6 +35,7 @@ and
 git clone https://github.com/paritytech/cumulus
 cd cumulus
 cargo build --release -p polkadot-collator
+cp ./target/release/polkadot-collator ../polkadot-launch/bin/polkadot-collator
 ```
 
 ## Use
diff --git a/package.json b/package.json
index 51437c6..8850c8f 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
 		"start": "yarn build && node dist/cli.js",
 		"lint": "prettier -v && prettier --check .",
 		"lint:write": "prettier --write .",
-		"para-test": "mocha -r ts-node/register 'test/tests/**/test-*.ts'"
+		"para-test": "mocha -r ts-node/register 'test/tests/**/test-*.ts'",
+		"para-test-no-ci": "mocha -r ts-node/register 'test/tests-no-ci/**/test-*.ts'"
 	},
 	"dependencies": {
 		"@polkadot/api": "^6.10.3",
diff --git a/src/runner.ts b/src/runner.ts
index 7047be1..8912f42 100644
--- a/src/runner.ts
+++ b/src/runner.ts
@@ -123,7 +123,8 @@ export async function run(config_dir: string, rawConfig: LaunchConfig) {
 
 	// Then launch each parachain
 	for (const parachain of config.parachains) {
-		const { id, resolvedId, balance, chain } = parachain;
+		const { id, resolvedId, balance } = parachain;
+
 		const bin = resolve(config_dir, parachain.bin);
 		if (!fs.existsSync(bin)) {
 			console.error("Parachain binary does not exist: ", bin);
@@ -137,13 +138,11 @@ export async function run(config_dir: string, rawConfig: LaunchConfig) {
 				`Starting a Collator for parachain ${resolvedId}: ${account}, Collator port : ${port} wsPort : ${wsPort} rpcPort : ${rpcPort}`
 			);
 			const skip_id_arg = !id;
-			await startCollator(bin, resolvedId, wsPort, rpcPort, port, {
+			await startCollator(bin, wsPort, rpcPort, port, {
 				name,
-				chain,
 				spec,
 				flags,
 				basePath,
-				skip_id_arg,
 				onlyOneParachainNode: config.parachains.length === 1,
 			});
 		}
@@ -186,7 +185,6 @@ export async function run(config_dir: string, rawConfig: LaunchConfig) {
 
 interface GenesisParachain {
 	isSimple: boolean;
-	id?: string;
 	resolvedId: string;
 	chain?: string;
 	bin: string;
@@ -210,7 +208,7 @@ async function addParachainsToGenesis(
 	let paras = x.concat(y);
 
 	for (const parachain of paras) {
-		const { isSimple, id, resolvedId, chain } = parachain;
+		const { resolvedId, chain } = parachain;
 		const bin = resolve(config_dir, parachain.bin);
 		if (!fs.existsSync(bin)) {
 			console.error("Parachain binary does not exist: ", bin);
@@ -222,15 +220,8 @@ async function addParachainsToGenesis(
 			let genesisState: string;
 			let genesisWasm: string;
 			try {
-				if (isSimple) {
-					// adder-collator does not support `--parachain-id` for export-genesis-state (and it is
-					// not necessary for it anyway), so we don't pass it here.
-					genesisState = await exportGenesisState(bin);
-					genesisWasm = await exportGenesisWasm(bin);
-				} else {
-					genesisState = await exportGenesisState(bin, id, chain);
-					genesisWasm = await exportGenesisWasm(bin, chain);
-				}
+				genesisState = await exportGenesisState(bin, chain);
+				genesisWasm = await exportGenesisWasm(bin);
 			} catch (err) {
 				console.error(err);
 				process.exit(1);
diff --git a/src/spawn.ts b/src/spawn.ts
index b4a0d32..34cd6f9 100644
--- a/src/spawn.ts
+++ b/src/spawn.ts
@@ -145,9 +145,6 @@ export async function exportGenesisWasm(
 	chain?: string
 ): Promise<string> {
 	let args = ["export-genesis-wasm"];
-	if (chain) {
-		args.push("--chain=" + chain);
-	}
 
 	// wasm files are typically large and `exec` requires us to supply the maximum buffer size in
 	// advance. Hopefully, this generous limit will be enough.
@@ -162,13 +159,10 @@ export async function exportGenesisWasm(
 /// Export the genesis state aka genesis head.
 export async function exportGenesisState(
 	bin: string,
-	id?: string,
 	chain?: string
 ): Promise<string> {
 	let args = ["export-genesis-state"];
-	if (id) {
-		args.push("--parachain-id=" + id);
-	}
+
 	if (chain) {
 		args.push("--chain=" + chain);
 	}
@@ -186,7 +180,6 @@ export async function exportGenesisState(
 // Start a collator node for a parachain.
 export function startCollator(
 	bin: string,
-	id: string,
 	wsPort: number,
 	rpcPort: number | undefined,
 	port: number,
@@ -195,15 +188,7 @@ export function startCollator(
 	return new Promise<void>(function (resolve) {
 		// TODO: Make DB directory configurable rather than just `tmp`
 		let args = ["--ws-port=" + wsPort, "--port=" + port];
-		const {
-			basePath,
-			name,
-			skip_id_arg,
-			onlyOneParachainNode,
-			chain,
-			flags,
-			spec,
-		} = options;
+		const { basePath, name, onlyOneParachainNode, flags, spec } = options;
 
 		if (rpcPort) {
 			args.push("--rpc-port=" + rpcPort);
@@ -221,18 +206,11 @@ export function startCollator(
 			args.push(`--${name.toLowerCase()}`);
 			console.log(`Added --${name.toLowerCase()}`);
 		}
-		if (!skip_id_arg) {
-			args.push("--parachain-id=" + id);
-			console.log(`Added --parachain-id=${id}`);
-		}
+
 		if (onlyOneParachainNode) {
 			args.push("--force-authoring");
 			console.log(`Added --force-authoring`);
 		}
-		if (chain) {
-			args.push("--chain=" + chain);
-			console.log(`Added --chain=${chain}`);
-		}
 
 		let flags_collator = null;
 		let flags_parachain = null;
diff --git a/src/spec.ts b/src/spec.ts
index 60c4fea..90e5bda 100644
--- a/src/spec.ts
+++ b/src/spec.ts
@@ -122,6 +122,7 @@ export async function addGenesisParachain(
 		paras.push(new_para);
 
 		let data = JSON.stringify(chainSpec, null, 2);
+
 		fs.writeFileSync(spec, data);
 		console.log(`  ✓ Added Genesis Parachain ${para_id}`);
 	} else {
diff --git a/src/types.d.ts b/src/types.d.ts
index 3e322b8..66666c8 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -1,10 +1,8 @@
 export interface CollatorOptions {
 	name?: string;
-	chain?: string;
 	spec?: string;
 	flags?: string[];
 	basePath?: string;
-	skip_id_arg?: boolean;
 	onlyOneParachainNode?: boolean;
 }
 
diff --git a/test/test-utils/constants.ts b/test/test-utils/constants.ts
index 7e38750..5dc3c46 100644
--- a/test/test-utils/constants.ts
+++ b/test/test-utils/constants.ts
@@ -5,9 +5,9 @@ export const DISPLAY_LOG = process.env.PARACHAIN_LOG || false;
 export const PARACHAIN_LOG = process.env.PARACHAIN_LOG || "info";
 
 export const BINARY_PATH =
-	process.env.BINARY_PATH || `../bin/polkadot-collator-mac`;
+	process.env.BINARY_PATH || `../bin/polkadot-collator`;
 export const RELAY_BINARY_PATH =
-	process.env.RELAY_BINARY_PATH || `../bin/polkadot-relaychain-mac`;
+	process.env.RELAY_BINARY_PATH || `../bin/polkadot-relaychain`;
 export const SPAWNING_TIME = 20000;
 export const ETHAPI_CMD = process.env.ETHAPI_CMD || "";
 
diff --git a/test/test-utils/para-node.ts b/test/test-utils/para-node.ts
index 74bbcad..b861a61 100644
--- a/test/test-utils/para-node.ts
+++ b/test/test-utils/para-node.ts
@@ -4,8 +4,6 @@ import { killAll, run } from "../../src"; //"polkadot-launch";
 import {
 	BINARY_PATH,
 	RELAY_BINARY_PATH,
-	DISPLAY_LOG,
-	SPAWNING_TIME,
 	RELAY_CHAIN_NODE_NAMES,
 } from "./constants";
 const debug = require("debug")("test:para-node");
@@ -156,7 +154,6 @@ export async function startParachainNodes(options: ParachainOptions): Promise<{
 				bin: BINARY_PATH,
 				id: (1000 * (i + 1)).toString(),
 				balance: "1000000000000000000000",
-				// chain: options.chain, this is not supported by cumulus
 				nodes: [
 					{
 						port: ports[i * 2 + numberOfParachains + 1].p2pPort,
diff --git a/test/tests-no-ci/test-balance-genesis-2-parachains.ts b/test/tests-no-ci/test-balance-genesis-2-parachains.ts
new file mode 100644
index 0000000..6c24243
--- /dev/null
+++ b/test/tests-no-ci/test-balance-genesis-2-parachains.ts
@@ -0,0 +1,34 @@
+import Keyring from "@polkadot/keyring";
+import { expect } from "chai";
+
+import { describeParachain } from "../test-utils/setup-para-tests";
+
+describeParachain(
+	"Balance genesis",
+	{ chain: "rococo-local", numberOfParachains: 2 },
+	(context) => {
+		it("should be accessible through web3", async function () {
+			const keyring = new Keyring({ type: "sr25519" });
+			const aliceRelay = keyring.addFromUri("//Alice");
+
+			//check parachain id
+			expect(
+				(
+					(await context._polkadotApiRelaychains[0].query.paras.parachains()) as any
+				)[0].toString()
+			).to.eq("1000");
+			expect(
+				(
+					(await context._polkadotApiRelaychains[0].query.paras.parachains()) as any
+				)[1].toString()
+			).to.eq("2000");
+			expect(
+				(
+					await context.polkadotApiParaone.query.system.account(
+						aliceRelay.addressRaw
+					)
+				).data.free.toHuman()
+			).to.eq("1,152,921,504,606,846,976");
+		});
+	}
+);
diff --git a/test/tests/test-balance-genesis.ts b/test/tests/test-balance-genesis.ts
index 003cdde..f57ec17 100644
--- a/test/tests/test-balance-genesis.ts
+++ b/test/tests/test-balance-genesis.ts
@@ -7,6 +7,14 @@ describeParachain("Balance genesis", { chain: "rococo-local" }, (context) => {
 	it("should be accessible through web3", async function () {
 		const keyring = new Keyring({ type: "sr25519" });
 		const aliceRelay = keyring.addFromUri("//Alice");
+
+		//check parachain id
+		expect(
+			(
+				(await context._polkadotApiRelaychains[0].query.paras.parachains()) as any
+			)[0].toString()
+		).to.eq("1000");
+		// check genesis balance
 		expect(
 			(
 				await context.polkadotApiParaone.query.system.account(