diff --git a/custom_types/src/lib.rs b/custom_types/src/lib.rs
index 36e34520..fb0b4d39 100644
--- a/custom_types/src/lib.rs
+++ b/custom_types/src/lib.rs
@@ -1,202 +1,42 @@
 #![no_std]
-use soroban_sdk::{
-    contract, contracterror, contractimpl, contracttype, symbol_short, vec, Address, Bytes, BytesN,
-    Env, Map, String, Symbol, Val, Vec, I256, U256,
-};
-
-const COUNTER: Symbol = symbol_short!("COUNTER");
-
-#[contract]
-pub struct CustomTypesContract;
-
-/// This is from the rust doc above the struct Test
-#[contracttype]
-pub struct Test {
-    pub a: u32,
-    pub b: bool,
-    pub c: Symbol,
-}
-
-#[contracttype]
-pub enum SimpleEnum {
-    First,
-    Second,
-    Third,
-}
+use soroban_sdk::{contract, contractimpl, contracttype, symbol_short, Env, Symbol};
 
 #[contracttype]
-#[derive(Clone, Copy)]
-// The `repr` attribute is here to specify the memory alignment for this type
-#[repr(u32)]
-pub enum RoyalCard {
-    // TODO: create the fields here for your `RoyalCard` type
-    Jack = 11,  // delete this
-    Queen = 12, // delete this
-    King = 13,  // delete this
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct State {
+    pub count: u32,
+    pub last_incr: u32,
 }
 
-#[contracttype]
-pub struct TupleStruct(Test, SimpleEnum);
+const STATE: Symbol = symbol_short!("STATE");
 
-#[contracttype]
-pub enum ComplexEnum {
-    Struct(Test),
-    Tuple(TupleStruct),
-    Enum(SimpleEnum),
-    Asset(Address, i128),
-    Void,
-}
+#[contract]
+pub struct IncrementContract;
 
-#[contracterror]
-#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
-#[repr(u32)]
-pub enum Error {
-    /// Please provide an odd number
-    NumberMustBeOdd = 1,
-}
 #[contractimpl]
-impl CustomTypesContract {
-    pub fn hello(_env: Env, hello: Symbol) -> Symbol {
-        hello
-    }
-
-    pub fn auth(env: Env, addr: Address, world: Symbol) -> Address {
-        addr.require_auth();
-        // Emit test event
-        env.events().publish(("auth",), world);
-
-        addr
-    }
-
-    // get current count
-    pub fn get_count(env: Env) -> u32 {
-        env.storage().persistent().get(&COUNTER).unwrap_or(0)
-    }
-
-    // increment count and return new one
-    pub fn inc(env: Env) -> u32 {
-        let mut count: u32 = env.storage().persistent().get(&COUNTER).unwrap_or(0); // Panic if the value of COUNTER is not u32.
-        count += 1;
-        env.storage().persistent().set(&COUNTER, &count);
-        count
-    }
-
-    pub fn woid(_env: Env) {
-        // do nothing
-    }
-
-    pub fn val(_env: Env) -> Val {
-        Val::default()
-    }
-
-    pub fn u32_fail_on_even(_env: Env, u32_: u32) -> Result<u32, Error> {
-        if u32_ % 2 == 1 {
-            Ok(u32_)
-        } else {
-            Err(Error::NumberMustBeOdd)
-        }
-    }
-
-    pub fn u32_(_env: Env, u32_: u32) -> u32 {
-        u32_
-    }
-
-    pub fn i32_(_env: Env, i32_: i32) -> i32 {
-        i32_
-    }
-
-    pub fn i64_(_env: Env, i64_: i64) -> i64 {
-        i64_
-    }
-
-    /// Example contract method which takes a struct
-    pub fn strukt_hel(env: Env, strukt: Test) -> Vec<Symbol> {
-        vec![&env, symbol_short!("Hello"), strukt.c]
-    }
+impl IncrementContract {
+    /// Increment increments an internal counter, and returns the value.
+    pub fn increment(env: Env, incr: u32) -> u32 {
+        // Get the current count.
+        let mut state = Self::get_state(env.clone());
 
-    pub fn strukt(_env: Env, strukt: Test) -> Test {
-        strukt
-    }
-
-    pub fn simple(_env: Env, simple: SimpleEnum) -> SimpleEnum {
-        simple
-    }
-
-    pub fn complex(_env: Env, complex: ComplexEnum) -> ComplexEnum {
-        complex
-    }
-
-    pub fn addresse(_env: Env, addresse: Address) -> Address {
-        addresse
-    }
-
-    pub fn bytes(_env: Env, bytes: Bytes) -> Bytes {
-        bytes
-    }
-
-    pub fn bytes_n(_env: Env, bytes_n: BytesN<9>) -> BytesN<9> {
-        bytes_n
-    }
-
-    pub fn card(_env: Env, card: RoyalCard) -> RoyalCard {
-        card
-    }
-
-    pub fn boolean(_: Env, boolean: bool) -> bool {
-        boolean
-    }
-
-    /// Negates a boolean value
-    pub fn not(_env: Env, boolean: bool) -> bool {
-        !boolean
-    }
-
-    pub fn i128(_env: Env, i128: i128) -> i128 {
-        i128
-    }
-
-    pub fn u128(_env: Env, u128: u128) -> u128 {
-        u128
-    }
-
-    pub fn multi_args(_env: Env, a: u32, b: bool) -> u32 {
-        if b {
-            a
-        } else {
-            0
-        }
-    }
-
-    pub fn map(_env: Env, map: Map<u32, bool>) -> Map<u32, bool> {
-        map
-    }
-
-    pub fn vec(_env: Env, vec: Vec<u32>) -> Vec<u32> {
-        vec
-    }
+        // Increment the count.
+        state.count += incr;
+        state.last_incr = incr;
 
-    pub fn tuple(_env: Env, tuple: (Symbol, u32)) -> (Symbol, u32) {
-        tuple
-    }
+        // Save the count.
+        env.storage().instance().set(&STATE, &state);
 
-    /// Example of an optional argument
-    pub fn option(_env: Env, option: Option<u32>) -> Option<u32> {
-        option
+        // Return the count to the caller.
+        state.count
     }
-
-    pub fn u256(_env: Env, u256: U256) -> U256 {
-        u256
-    }
-
-    pub fn i256(_env: Env, i256: I256) -> I256 {
-        i256
-    }
-
-    pub fn string(_env: Env, string: String) -> String {
-        string
-    }
-
-    pub fn tuple_strukt(_env: Env, tuple_strukt: TupleStruct) -> TupleStruct {
-        tuple_strukt
+    /// Return the current state.
+    pub fn get_state(env: Env) -> State {
+        env.storage().instance().get(&STATE).unwrap_or(State {
+            count: 0,
+            last_incr: 0,
+        }) // If no value set, assume 0.
     }
 }
+
+mod test;
diff --git a/custom_types/src/test.rs b/custom_types/src/test.rs
index 4756c2e9..6ff72f78 100644
--- a/custom_types/src/test.rs
+++ b/custom_types/src/test.rs
@@ -6,7 +6,16 @@ use soroban_sdk::Env;
 #[test]
 fn test() {
     let env = Env::default();
-    let contract_id = env.register_contract(None, CustomTypesContract);
-    let client = CustomTypesContractClient::new(&env, &contract_id);
-    assert_eq!(client.u32_fail_on_even(&1), 1);
+    let contract_id = env.register_contract(None, IncrementContract);
+    let client = IncrementContractClient::new(&env, &contract_id);
+
+    assert_eq!(client.increment(&1), 1);
+    assert_eq!(client.increment(&10), 11);
+    assert_eq!(
+        client.get_state(),
+        State {
+            count: 11,
+            last_incr: 10
+        }
+    );
 }
diff --git a/other_custom_types/Cargo.lock b/other_custom_types/Cargo.lock
new file mode 100644
index 00000000..317aff8e
--- /dev/null
+++ b/other_custom_types/Cargo.lock
@@ -0,0 +1,1556 @@
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diff --git a/other_custom_types/Cargo.toml b/other_custom_types/Cargo.toml
new file mode 100644
index 00000000..dbbe04f8
--- /dev/null
+++ b/other_custom_types/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "soroban-other-custom-types-contract"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+doctest = false
+
+[dependencies]
+soroban-sdk = { version = "21.4.0" }
+
+[dev-dependencies]
+soroban-sdk = { version = "21.4.0", features = ["testutils"] }
+
+[profile.release]
+opt-level = "z"
+overflow-checks = true
+debug = 0
+strip = "symbols"
+debug-assertions = false
+panic = "abort"
+codegen-units = 1
+lto = true
+
+[profile.release-with-logs]
+inherits = "release"
+debug-assertions = true
diff --git a/other_custom_types/Makefile b/other_custom_types/Makefile
new file mode 100644
index 00000000..71ad4a6c
--- /dev/null
+++ b/other_custom_types/Makefile
@@ -0,0 +1,16 @@
+default: build
+
+all: test
+
+test: build
+	cargo test
+
+build:
+	soroban contract build
+	@ls -l target/wasm32-unknown-unknown/release/*.wasm
+
+fmt:
+	cargo fmt --all
+
+clean:
+	cargo clean
diff --git a/other_custom_types/src/lib.rs b/other_custom_types/src/lib.rs
new file mode 100644
index 00000000..36e34520
--- /dev/null
+++ b/other_custom_types/src/lib.rs
@@ -0,0 +1,202 @@
+#![no_std]
+use soroban_sdk::{
+    contract, contracterror, contractimpl, contracttype, symbol_short, vec, Address, Bytes, BytesN,
+    Env, Map, String, Symbol, Val, Vec, I256, U256,
+};
+
+const COUNTER: Symbol = symbol_short!("COUNTER");
+
+#[contract]
+pub struct CustomTypesContract;
+
+/// This is from the rust doc above the struct Test
+#[contracttype]
+pub struct Test {
+    pub a: u32,
+    pub b: bool,
+    pub c: Symbol,
+}
+
+#[contracttype]
+pub enum SimpleEnum {
+    First,
+    Second,
+    Third,
+}
+
+#[contracttype]
+#[derive(Clone, Copy)]
+// The `repr` attribute is here to specify the memory alignment for this type
+#[repr(u32)]
+pub enum RoyalCard {
+    // TODO: create the fields here for your `RoyalCard` type
+    Jack = 11,  // delete this
+    Queen = 12, // delete this
+    King = 13,  // delete this
+}
+
+#[contracttype]
+pub struct TupleStruct(Test, SimpleEnum);
+
+#[contracttype]
+pub enum ComplexEnum {
+    Struct(Test),
+    Tuple(TupleStruct),
+    Enum(SimpleEnum),
+    Asset(Address, i128),
+    Void,
+}
+
+#[contracterror]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
+#[repr(u32)]
+pub enum Error {
+    /// Please provide an odd number
+    NumberMustBeOdd = 1,
+}
+#[contractimpl]
+impl CustomTypesContract {
+    pub fn hello(_env: Env, hello: Symbol) -> Symbol {
+        hello
+    }
+
+    pub fn auth(env: Env, addr: Address, world: Symbol) -> Address {
+        addr.require_auth();
+        // Emit test event
+        env.events().publish(("auth",), world);
+
+        addr
+    }
+
+    // get current count
+    pub fn get_count(env: Env) -> u32 {
+        env.storage().persistent().get(&COUNTER).unwrap_or(0)
+    }
+
+    // increment count and return new one
+    pub fn inc(env: Env) -> u32 {
+        let mut count: u32 = env.storage().persistent().get(&COUNTER).unwrap_or(0); // Panic if the value of COUNTER is not u32.
+        count += 1;
+        env.storage().persistent().set(&COUNTER, &count);
+        count
+    }
+
+    pub fn woid(_env: Env) {
+        // do nothing
+    }
+
+    pub fn val(_env: Env) -> Val {
+        Val::default()
+    }
+
+    pub fn u32_fail_on_even(_env: Env, u32_: u32) -> Result<u32, Error> {
+        if u32_ % 2 == 1 {
+            Ok(u32_)
+        } else {
+            Err(Error::NumberMustBeOdd)
+        }
+    }
+
+    pub fn u32_(_env: Env, u32_: u32) -> u32 {
+        u32_
+    }
+
+    pub fn i32_(_env: Env, i32_: i32) -> i32 {
+        i32_
+    }
+
+    pub fn i64_(_env: Env, i64_: i64) -> i64 {
+        i64_
+    }
+
+    /// Example contract method which takes a struct
+    pub fn strukt_hel(env: Env, strukt: Test) -> Vec<Symbol> {
+        vec![&env, symbol_short!("Hello"), strukt.c]
+    }
+
+    pub fn strukt(_env: Env, strukt: Test) -> Test {
+        strukt
+    }
+
+    pub fn simple(_env: Env, simple: SimpleEnum) -> SimpleEnum {
+        simple
+    }
+
+    pub fn complex(_env: Env, complex: ComplexEnum) -> ComplexEnum {
+        complex
+    }
+
+    pub fn addresse(_env: Env, addresse: Address) -> Address {
+        addresse
+    }
+
+    pub fn bytes(_env: Env, bytes: Bytes) -> Bytes {
+        bytes
+    }
+
+    pub fn bytes_n(_env: Env, bytes_n: BytesN<9>) -> BytesN<9> {
+        bytes_n
+    }
+
+    pub fn card(_env: Env, card: RoyalCard) -> RoyalCard {
+        card
+    }
+
+    pub fn boolean(_: Env, boolean: bool) -> bool {
+        boolean
+    }
+
+    /// Negates a boolean value
+    pub fn not(_env: Env, boolean: bool) -> bool {
+        !boolean
+    }
+
+    pub fn i128(_env: Env, i128: i128) -> i128 {
+        i128
+    }
+
+    pub fn u128(_env: Env, u128: u128) -> u128 {
+        u128
+    }
+
+    pub fn multi_args(_env: Env, a: u32, b: bool) -> u32 {
+        if b {
+            a
+        } else {
+            0
+        }
+    }
+
+    pub fn map(_env: Env, map: Map<u32, bool>) -> Map<u32, bool> {
+        map
+    }
+
+    pub fn vec(_env: Env, vec: Vec<u32>) -> Vec<u32> {
+        vec
+    }
+
+    pub fn tuple(_env: Env, tuple: (Symbol, u32)) -> (Symbol, u32) {
+        tuple
+    }
+
+    /// Example of an optional argument
+    pub fn option(_env: Env, option: Option<u32>) -> Option<u32> {
+        option
+    }
+
+    pub fn u256(_env: Env, u256: U256) -> U256 {
+        u256
+    }
+
+    pub fn i256(_env: Env, i256: I256) -> I256 {
+        i256
+    }
+
+    pub fn string(_env: Env, string: String) -> String {
+        string
+    }
+
+    pub fn tuple_strukt(_env: Env, tuple_strukt: TupleStruct) -> TupleStruct {
+        tuple_strukt
+    }
+}
diff --git a/other_custom_types/src/test.rs b/other_custom_types/src/test.rs
new file mode 100644
index 00000000..4756c2e9
--- /dev/null
+++ b/other_custom_types/src/test.rs
@@ -0,0 +1,12 @@
+#![cfg(test)]
+
+use super::*;
+use soroban_sdk::Env;
+
+#[test]
+fn test() {
+    let env = Env::default();
+    let contract_id = env.register_contract(None, CustomTypesContract);
+    let client = CustomTypesContractClient::new(&env, &contract_id);
+    assert_eq!(client.u32_fail_on_even(&1), 1);
+}