diff --git a/core/src/genesis.rs b/core/src/genesis.rs
index f981c59ff..710cd6845 100644
--- a/core/src/genesis.rs
+++ b/core/src/genesis.rs
@@ -74,9 +74,7 @@ pub fn genesis_testnet1() -> core::Block {
 	}
 }
 
-/// Second testnet genesis block (cuckoo30). TBD and don't start getting excited
-/// just because you see this reference here... this is for testing mining
-/// at cuckoo 30
+/// Second testnet genesis block (cuckoo30).
 pub fn genesis_testnet2() -> core::Block {
 	core::Block {
 		header: core::BlockHeader {
@@ -107,6 +105,37 @@ pub fn genesis_testnet2() -> core::Block {
 	}
 }
 
+/// Second testnet genesis block (cuckoo30). Temporary values for now.
+pub fn genesis_testnet3() -> core::Block {
+	core::Block {
+		header: core::BlockHeader {
+			height: 0,
+			previous: core::hash::Hash([0xff; 32]),
+			timestamp: time::Tm {
+				tm_year: 2018 - 1900,
+				tm_mon: 6,
+				tm_mday: 2,
+				tm_hour: 0,
+				..time::empty_tm()
+			},
+			total_difficulty: Difficulty::from_num(global::initial_block_difficulty()),
+			nonce: 1060,
+			pow: core::Proof::new(vec![
+				0x1940730, 0x333b9d0, 0x4739d6f, 0x4c6cfb1, 0x6e3d6c3, 0x74408a3, 0x7ba2bd2,
+				0x83e2024, 0x8ca22b5, 0x9d39ab8, 0xb6646dd, 0xc6698b6, 0xc6f78fe, 0xc99b662,
+				0xcf2ae8c, 0xcf41eed, 0xdd073e6, 0xded6af8, 0xf08d1a5, 0x1156a144, 0x11d1160a,
+				0x131bb0a5, 0x137ad703, 0x13b0831f, 0x1421683f, 0x147e3c1f, 0x1496fda0, 0x150ba22b,
+				0x15cc5bc6, 0x16edf697, 0x17ced40c, 0x17d84f9e, 0x18a515c1, 0x19320d9c, 0x19da4f6d,
+				0x1b50bcb1, 0x1b8bc72f, 0x1c7b6964, 0x1d07b3a9, 0x1d189d4d, 0x1d1f9a15, 0x1dafcd41,
+			]),
+			..Default::default()
+		},
+		inputs: vec![],
+		outputs: vec![],
+		kernels: vec![],
+	}
+}
+
 /// Placeholder for mainnet genesis block, will definitely change before
 /// release so no use trying to pre-mine it.
 pub fn genesis_main() -> core::Block {
diff --git a/core/src/global.rs b/core/src/global.rs
index 2614557d6..8144eab63 100644
--- a/core/src/global.rs
+++ b/core/src/global.rs
@@ -59,22 +59,24 @@ pub const TESTING_INITIAL_DIFFICULTY: u64 = 1;
 /// Testnet 2 initial block difficulty, high to see how it goes
 pub const TESTNET2_INITIAL_DIFFICULTY: u64 = 1000;
 
+/// Testnet 2 initial block difficulty, moderatly hight, taking into account
+/// a 30x Cuckoo adjustment factor
+pub const TESTNET3_INITIAL_DIFFICULTY: u64 = 15000;
+
 /// Types of chain a server can run with, dictates the genesis block and
 /// and mining parameters used.
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub enum ChainTypes {
 	/// For CI testing
 	AutomatedTesting,
-
 	/// For User testing
 	UserTesting,
-
 	/// First test network
 	Testnet1,
-
 	/// Second test network
 	Testnet2,
-
+	/// Thirs test network
+	Testnet3,
 	/// Main production network
 	Mainnet,
 }
@@ -105,6 +107,7 @@ pub fn min_sizeshift() -> u8 {
 		ChainTypes::UserTesting => USER_TESTING_MIN_SIZESHIFT,
 		ChainTypes::Testnet1 => USER_TESTING_MIN_SIZESHIFT,
 		ChainTypes::Testnet2 => DEFAULT_MIN_SIZESHIFT,
+		ChainTypes::Testnet3 => DEFAULT_MIN_SIZESHIFT,
 		ChainTypes::Mainnet => DEFAULT_MIN_SIZESHIFT,
 	}
 }
@@ -119,6 +122,7 @@ pub fn ref_sizeshift() -> u8 {
 		ChainTypes::UserTesting => USER_TESTING_MIN_SIZESHIFT,
 		ChainTypes::Testnet1 => USER_TESTING_MIN_SIZESHIFT,
 		ChainTypes::Testnet2 => REFERENCE_SIZESHIFT,
+		ChainTypes::Testnet3 => REFERENCE_SIZESHIFT,
 		ChainTypes::Mainnet => REFERENCE_SIZESHIFT,
 	}
 }
@@ -131,6 +135,7 @@ pub fn proofsize() -> usize {
 		ChainTypes::UserTesting => USER_TESTING_PROOF_SIZE,
 		ChainTypes::Testnet1 => PROOFSIZE,
 		ChainTypes::Testnet2 => PROOFSIZE,
+		ChainTypes::Testnet3 => PROOFSIZE,
 		ChainTypes::Mainnet => PROOFSIZE,
 	}
 }
@@ -143,6 +148,7 @@ pub fn coinbase_maturity() -> u64 {
 		ChainTypes::UserTesting => USER_TESTING_COINBASE_MATURITY,
 		ChainTypes::Testnet1 => COINBASE_MATURITY,
 		ChainTypes::Testnet2 => COINBASE_MATURITY,
+		ChainTypes::Testnet3 => COINBASE_MATURITY,
 		ChainTypes::Mainnet => COINBASE_MATURITY,
 	}
 }
@@ -155,6 +161,7 @@ pub fn initial_block_difficulty() -> u64 {
 		ChainTypes::UserTesting => TESTING_INITIAL_DIFFICULTY,
 		ChainTypes::Testnet1 => TESTING_INITIAL_DIFFICULTY,
 		ChainTypes::Testnet2 => TESTNET2_INITIAL_DIFFICULTY,
+		ChainTypes::Testnet3 => TESTNET2_INITIAL_DIFFICULTY,
 		ChainTypes::Mainnet => INITIAL_DIFFICULTY,
 	}
 }
@@ -167,6 +174,7 @@ pub fn cut_through_horizon() -> u32 {
 		ChainTypes::UserTesting => TESTING_CUT_THROUGH_HORIZON,
 		ChainTypes::Testnet1 => CUT_THROUGH_HORIZON,
 		ChainTypes::Testnet2 => CUT_THROUGH_HORIZON,
+		ChainTypes::Testnet3 => CUT_THROUGH_HORIZON,
 		ChainTypes::Mainnet => CUT_THROUGH_HORIZON,
 	}
 }
@@ -188,6 +196,7 @@ pub fn is_production_mode() -> bool {
 	let param_ref = CHAIN_TYPE.read().unwrap();
 	ChainTypes::Testnet1 == *param_ref
 		|| ChainTypes::Testnet2 == *param_ref
+		|| ChainTypes::Testnet3 == *param_ref
 		|| ChainTypes::Mainnet == *param_ref
 }
 
diff --git a/servers/src/grin/server.rs b/servers/src/grin/server.rs
index e96c3cb46..17cf02162 100644
--- a/servers/src/grin/server.rs
+++ b/servers/src/grin/server.rs
@@ -124,6 +124,7 @@ impl Server {
 		let genesis = match config.chain_type {
 			global::ChainTypes::Testnet1 => genesis::genesis_testnet1(),
 			global::ChainTypes::Testnet2 => genesis::genesis_testnet2(),
+			global::ChainTypes::Testnet3 => genesis::genesis_testnet3(),
 			global::ChainTypes::AutomatedTesting => genesis::genesis_dev(),
 			global::ChainTypes::UserTesting => genesis::genesis_dev(),
 			global::ChainTypes::Mainnet => genesis::genesis_testnet2(), //TODO: Fix, obviously