diff --git a/foundry.toml b/foundry.toml
index 5ceefe9fd1..e870d239d5 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -14,6 +14,7 @@ remappings = [
   '@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts',
   '@base-contracts/=lib/base-contracts/',
   '@eth-optimism-bedrock/=lib/optimism/packages/contracts-bedrock/',
+  '@op/=lib/optimism/packages/contracts-bedrock/',
   '@rari-capital/solmate/=lib/solmate',
   '@eth-optimism-superchain-registry/=lib/superchain-registry/',
   '@solady/=lib/optimism/packages/contracts-bedrock/lib/solady/src/',
diff --git a/src/improvements/template/AddGameTypeTemplate.sol b/src/improvements/template/AddGameTypeTemplate.sol
new file mode 100644
index 0000000000..a8fcab0392
--- /dev/null
+++ b/src/improvements/template/AddGameTypeTemplate.sol
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
+
+import {VmSafe} from "forge-std/Vm.sol";
+import {stdToml} from "forge-std/StdToml.sol";
+
+import {OPCMTaskBase} from "src/improvements/tasks/types/OPCMTaskBase.sol";
+import {SuperchainAddressRegistry} from "src/improvements/SuperchainAddressRegistry.sol";
+
+import {IDeputyGuardianModule, IOptimismPortal2} from "@op/interfaces/safe/IDeputyGuardianModule.sol";
+import {GameType, Claim, Duration} from "@op/src/dispute/lib/Types.sol";
+import {
+    IOPContractsManager,
+    IDisputeGameFactory,
+    IFaultDisputeGame,
+    IBigStepper,
+    IProxyAdmin,
+    IDelayedWETH,
+    ISystemConfig
+} from "@op/interfaces/L1/IOPContractsManager.sol";
+
+/// @title AddGameTypeTemplate
+/// @notice This template is used to add a game type to the DisputeGameFactory contract.
+contract AddGameTypeTemplate is OPCMTaskBase {
+    using stdToml for string;
+
+    /// @notice Struct that extends the original AddGameInput struct and includes the chain id.
+    ///         Notably the fields here are also in alphabetical order, this is required because of
+    ///         the way that Foundry parses TOML data. This MUST be kept in alphabetical order. If
+    ///         you are adding a new field, you MUST make sure it's in order. Seriously.
+    struct AddGameInputWithChainId {
+        uint256 chainId;
+        IDelayedWETH delayedWETH;
+        Claim disputeAbsolutePrestate;
+        Duration disputeClockExtension;
+        GameType disputeGameType;
+        Duration disputeMaxClockDuration;
+        uint256 disputeMaxGameDepth;
+        uint256 disputeSplitDepth;
+        uint256 initialBond;
+        bool permissioned;
+        IProxyAdmin proxyAdmin;
+        string saltMixer;
+        ISystemConfig systemConfig;
+        IBigStepper vm;
+    }
+
+    /// @notice Mapping of chain ID to configuration for the task.
+    mapping(uint256 => AddGameInputWithChainId) private cfg;
+
+    /// @notice Returns string identifiers for addresses that are expected to have their storage written to.
+    function _taskStorageWrites() internal pure override returns (string[] memory) {
+        string[] memory storageWrites = new string[](3);
+        storageWrites[0] = "ProxyAdminOwner";
+        storageWrites[1] = "OPCM";
+        storageWrites[2] = "DisputeGameFactoryProxy";
+        return storageWrites;
+    }
+
+    /// @notice Sets up the template with implementation configurations from a TOML file.
+    function _templateSetup(string memory taskConfigFilePath) internal override {
+        super._templateSetup(taskConfigFilePath);
+        string memory tomlContent = vm.readFile(taskConfigFilePath);
+
+        // Load configuration.
+        AddGameInputWithChainId[] memory configs =
+            abi.decode(tomlContent.parseRaw(".configs"), (AddGameInputWithChainId[]));
+        for (uint256 i = 0; i < configs.length; i++) {
+            cfg[configs[i].chainId] = configs[i];
+        }
+
+        // Load OPCM address.
+        OPCM = tomlContent.readAddress(".addresses.OPCM");
+        vm.label(OPCM, "OPCM");
+    }
+
+    /// @notice Write the calls that you want to execute for the task.
+    function _build() internal override {
+        // Iterate over the chains pull out the configs.
+        SuperchainAddressRegistry.ChainInfo[] memory chains = superchainAddrRegistry.getChains();
+        IOPContractsManager.AddGameInput[] memory configs = new IOPContractsManager.AddGameInput[](chains.length);
+        for (uint256 i = 0; i < chains.length; i++) {
+            uint256 chainId = chains[i].chainId;
+            configs[i] = _toAddGameInput(cfg[chainId]);
+        }
+
+        // Delegatecall the OPCM.addGameType() function.
+        (bool success,) = OPCM.delegatecall(abi.encodeCall(IOPContractsManager.addGameType, configs));
+        require(success, "AddGameType: failed to add game type");
+    }
+
+    /// @notice This method performs all validations and assertions that verify the calls executed as expected.
+    function _validate(VmSafe.AccountAccess[] memory, Action[] memory) internal view override {
+        // Iterate over the chains and validate the respected game type.
+        SuperchainAddressRegistry.ChainInfo[] memory chains = superchainAddrRegistry.getChains();
+        for (uint256 i = 0; i < chains.length; i++) {
+            uint256 chainId = chains[i].chainId;
+            address factoryAddress = superchainAddrRegistry.getAddress("DisputeGameFactoryProxy", chainId);
+            IDisputeGameFactory factory = IDisputeGameFactory(factoryAddress);
+            IFaultDisputeGame game = IFaultDisputeGame(address(factory.gameImpls(cfg[chainId].disputeGameType)));
+
+            // Assert that everything is as expected.
+            assertEq(address(game.weth()), address(cfg[chainId].delayedWETH));
+            assertEq(game.gameType().raw(), cfg[chainId].disputeGameType.raw());
+            assertEq(game.absolutePrestate().raw(), cfg[chainId].disputeAbsolutePrestate.raw());
+            assertEq(game.maxGameDepth(), cfg[chainId].disputeMaxGameDepth);
+            assertEq(game.splitDepth(), cfg[chainId].disputeSplitDepth);
+            assertEq(game.clockExtension().raw(), cfg[chainId].disputeClockExtension.raw());
+            assertEq(game.maxClockDuration().raw(), cfg[chainId].disputeMaxClockDuration.raw());
+
+            // Assert that the bond is set correctly.
+            assertEq(factory.initBonds(cfg[chainId].disputeGameType), cfg[chainId].initialBond);
+        }
+    }
+
+    /// @notice Override to return a list of addresses that should not be checked for code length.
+    function getCodeExceptions() internal pure override returns (address[] memory) {
+        address[] memory codeExceptions = new address[](0);
+        return codeExceptions;
+    }
+
+    /// @notice Converts the AddGameInputWithChainId struct to the AddGameInput struct.
+    function _toAddGameInput(AddGameInputWithChainId memory _input)
+        internal
+        pure
+        returns (IOPContractsManager.AddGameInput memory)
+    {
+        return IOPContractsManager.AddGameInput({
+            saltMixer: _input.saltMixer,
+            systemConfig: _input.systemConfig,
+            proxyAdmin: _input.proxyAdmin,
+            delayedWETH: _input.delayedWETH,
+            disputeGameType: _input.disputeGameType,
+            disputeAbsolutePrestate: _input.disputeAbsolutePrestate,
+            disputeMaxGameDepth: _input.disputeMaxGameDepth,
+            disputeSplitDepth: _input.disputeSplitDepth,
+            disputeClockExtension: _input.disputeClockExtension,
+            disputeMaxClockDuration: _input.disputeMaxClockDuration,
+            initialBond: _input.initialBond,
+            vm: _input.vm,
+            permissioned: _input.permissioned
+        });
+    }
+}
diff --git a/test/tasks/Regression.t.sol b/test/tasks/Regression.t.sol
index a9152400df..31dd7ebff5 100644
--- a/test/tasks/Regression.t.sol
+++ b/test/tasks/Regression.t.sol
@@ -23,6 +23,7 @@ import {TransferL2PAOFromL1} from "src/improvements/template/TransferL2PAOFromL1
 import {DisableModule} from "src/improvements/template/DisableModule.sol";
 import {Action} from "src/libraries/MultisigTypes.sol";
 import {GnosisSafeApproveHash} from "src/improvements/template/GnosisSafeApproveHash.sol";
+import {AddGameTypeTemplate} from "src/improvements/template/AddGameTypeTemplate.sol";
 
 /// @notice Ensures that simulating the task consistently produces the same call data and data to sign.
 /// This guarantees determinism—if a bug is introduced in the task logic, the call data or data to sign
@@ -364,6 +365,34 @@ contract RegressionTest is Test {
         _assertDataToSignNestedMultisig(multisigTask, actions, expectedDataToSign);
     }
 
+    /// @notice Expected call data and data to sign generated by manually running the AddGameType template at block 8383837 on Sepolia.
+    /// Simulate from task directory (test/tasks/example/sep/012-add-game-type) with:
+    /// SIMULATE_WITHOUT_LEDGER=1 just --dotenv-path $(pwd)/.env --justfile ../../../../../src/improvements/single.just simulate <foundation|council>
+    function testRegressionCalldataMatches_AddGameType() public {
+        string memory taskConfigFilePath = "test/tasks/example/sep/012-add-game-type/config.toml";
+
+        // Call data generated by manually running the AddGameType template at block 8383837 on Sepolia.
+        string memory expectedCallData =
+            "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";
+
+        MultisigTask multisigTask = new AddGameTypeTemplate();
+        address foundationChildMultisig = 0xDEe57160aAfCF04c34C887B5962D0a69676d3C8B;
+        MultisigTask.Action[] memory actions =
+            _setupAndSimulateRun(taskConfigFilePath, 8383837, "sepolia", multisigTask, foundationChildMultisig);
+
+        _assertCallData(multisigTask, actions, expectedCallData);
+
+        // Data to sign generated by manually running the AddGameType template at block 8383837 on Sepolia.
+        string[] memory expectedDataToSign = new string[](2);
+        // Foundation
+        expectedDataToSign[0] =
+            "0x190137e1f5dd3b92a004a23589b741196c8a214629d4ea3a690ec8e41ae45c689cbb195e8071f7d2fcb4120c11aec197007f1b41900d82f62741d1a58c134f350549";
+        // Security council
+        expectedDataToSign[1] =
+            "0x1901be081970e9fc104bd1ea27e375cd21ec7bb1eec56bfe43347c3e36c5d27b853304e459124b117bdf49183bbb2c639b7fde05b9ec9d15f554c8f1837ade2ad463";
+        _assertDataToSignNestedMultisig(multisigTask, actions, expectedDataToSign);
+    }
+
     /// @notice Expected call data and data to sign generated by manually running the TransferL2PAOFromL1 template at block 22447773 on mainnet.
     /// Simulate from task directory (test/tasks/example/eth/008-transfer-l2pao) with:
     /// SIMULATE_WITHOUT_LEDGER=1 just --dotenv-path $(pwd)/.env --justfile ../../../../../src/improvements/nested.just simulate <foundation|council>
diff --git a/test/tasks/example/sep/012-add-game-type/.env b/test/tasks/example/sep/012-add-game-type/.env
new file mode 100644
index 0000000000..1bfe2fa7fa
--- /dev/null
+++ b/test/tasks/example/sep/012-add-game-type/.env
@@ -0,0 +1 @@
+FORK_BLOCK_NUMBER=8383837
diff --git a/test/tasks/example/sep/012-add-game-type/config.toml b/test/tasks/example/sep/012-add-game-type/config.toml
new file mode 100644
index 0000000000..a7b02a7857
--- /dev/null
+++ b/test/tasks/example/sep/012-add-game-type/config.toml
@@ -0,0 +1,24 @@
+templateName = "AddGameTypeTemplate"
+
+l2chains = [    
+    {name = "OP Sepolia Testnet", chainId = 11155420},
+]
+
+[[configs]]
+chainId = 11155420
+saltMixer = "this is a salt mixer"
+systemConfig = "0x034edD2A225f7f429A63E0f1D2084B9E0A93b538"
+proxyAdmin = "0x189aBAAaa82DfC015A588A7dbaD6F13b1D3485Bc"
+delayedWETH = "0xcdFdC692a53B4aE9F81E0aEBd26107Da4a71dB84"
+disputeGameType = 0
+disputeAbsolutePrestate = "0x03682932cec7ce0a3874b19675a6bbc923054a7b321efc7d3835187b172494b6"
+disputeMaxGameDepth = 73
+disputeSplitDepth = 30
+disputeClockExtension = 10800
+disputeMaxClockDuration = 302400
+initialBond = 80000000000000000
+vm = "0xF027F4A985560fb13324e943edf55ad6F1d15Dc1"
+permissioned = false
+
+[addresses]
+OPCM = "0xfbceed4de885645fbded164910e10f52febfab35"
diff --git a/test/tasks/mock/configs/AddGameTypeTemplate.toml b/test/tasks/mock/configs/AddGameTypeTemplate.toml
new file mode 100644
index 0000000000..a7b02a7857
--- /dev/null
+++ b/test/tasks/mock/configs/AddGameTypeTemplate.toml
@@ -0,0 +1,24 @@
+templateName = "AddGameTypeTemplate"
+
+l2chains = [    
+    {name = "OP Sepolia Testnet", chainId = 11155420},
+]
+
+[[configs]]
+chainId = 11155420
+saltMixer = "this is a salt mixer"
+systemConfig = "0x034edD2A225f7f429A63E0f1D2084B9E0A93b538"
+proxyAdmin = "0x189aBAAaa82DfC015A588A7dbaD6F13b1D3485Bc"
+delayedWETH = "0xcdFdC692a53B4aE9F81E0aEBd26107Da4a71dB84"
+disputeGameType = 0
+disputeAbsolutePrestate = "0x03682932cec7ce0a3874b19675a6bbc923054a7b321efc7d3835187b172494b6"
+disputeMaxGameDepth = 73
+disputeSplitDepth = 30
+disputeClockExtension = 10800
+disputeMaxClockDuration = 302400
+initialBond = 80000000000000000
+vm = "0xF027F4A985560fb13324e943edf55ad6F1d15Dc1"
+permissioned = false
+
+[addresses]
+OPCM = "0xfbceed4de885645fbded164910e10f52febfab35"