diff --git a/.github/scripts/build-example-gba-files.sh b/.github/scripts/build-example-gba-files.sh
deleted file mode 100755
index beee0401..00000000
--- a/.github/scripts/build-example-gba-files.sh
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/usr/bin/env bash
-
-set -e # Fail if any command fails
-set -x # print every command before it runs
-
-# Requires gbafix and arm-none-eabi-objcopy to already be installed
-
-function build_rom() {
-    local GAME_FOLDER="$1"
-    local INTERNAL_NAME="$2"
-
-    local GAME_NAME
-    GAME_NAME="$(basename "$GAME_FOLDER")"
-
-    local TARGET_FOLDER="${CARGO_TARGET_DIR:-$GAME_FOLDER/target}"
-    local GBA_FILE="$TARGET_FOLDER/$GAME_NAME.gba"
-
-    (cd "$GAME_FOLDER" && cargo build --release --verbose --target thumbv4t-none-eabi)
-
-    mkdir -p examples/target/examples
-
-    arm-none-eabi-objcopy -O binary "$TARGET_FOLDER/thumbv4t-none-eabi/release/$GAME_NAME" "$GBA_FILE"
-    gbafix -p "-t${INTERNAL_NAME:0:12}" "-c${INTERNAL_NAME:0:4}" -mGC "$GBA_FILE"
-
-    cp -v "$GBA_FILE" "examples/target/examples/$GAME_NAME.gba"
-}
-
-mkdir -p examples/target
-
-build_rom "examples/the-purple-night" "PURPLENIGHT"
-build_rom "examples/the-hat-chooses-the-wizard" "HATWIZARD"
-
-build_rom "book/games/pong" "PONG"
-
-(cd examples/target && zip examples.zip examples/*.gba)
\ No newline at end of file
diff --git a/.github/scripts/run-branch-build.sh b/.github/scripts/run-branch-build.sh
deleted file mode 100644
index 45a5a8c4..00000000
--- a/.github/scripts/run-branch-build.sh
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/bin/env bash
-
-set -e # Fail if any command fails
-
-CARGO_PROJECT_FILES=( agb-*/Cargo.toml agb/Cargo.toml examples/*/Cargo.toml book/games/*/Cargo.toml )
-
-for CARGO_PROJECT_FILE in "${CARGO_PROJECT_FILES[@]}"; do
-    PROJECT_DIR=$(dirname "$CARGO_PROJECT_FILE")
-
-    echo "Checking project $PROJECT_DIR"
-    (cd "$PROJECT_DIR" && cargo build)
-
-    if echo "$PROJECT_DIR" | grep -qE '^agb'; then
-        echo "Running clippy on $PROJECT_DIR"
-        (cd "$PROJECT_DIR" && cargo clippy)
-
-        echo "Testing $PROJECT_DIR in debug mode"
-        (cd "$PROJECT_DIR" && cargo test)
-
-        echo "Testing $PROJECT_DIR in release mode"
-        (cd "$PROJECT_DIR" && cargo test --release)
-    fi
-done
diff --git a/.github/scripts/update-lockfiles.sh b/.github/scripts/update-lockfiles.sh
index 11ae32dc..e79e76a9 100755
--- a/.github/scripts/update-lockfiles.sh
+++ b/.github/scripts/update-lockfiles.sh
@@ -1,9 +1,7 @@
 #!/usr/bin/env bash
 
 function update_lockfiles() {
-    for toml in **/Cargo.toml; do 
-        (cd "$(dirname "$toml")" && cargo generate-lockfile)
-    done
+    find . -name Cargo.lock -execdir cargo update \;
 }
 
 update_lockfiles
diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 8cb69deb..8c385284 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -32,7 +32,6 @@ jobs:
       run: echo "CARGO_TARGET_DIR=$HOME/target" >> $GITHUB_ENV
     - name: Install gbafix
       run: cargo install gbafix
+    - uses: extractions/setup-just@v1
     - name: Build and test all crates
-      run: bash .github/scripts/run-branch-build.sh
-    - name: Build example projects
-      run: bash .github/scripts/build-example-gba-files.sh
\ No newline at end of file
+      run: just ci
\ No newline at end of file
diff --git a/.github/workflows/publish-agb.yml b/.github/workflows/publish-agb.yml
index df3b5c1b..f7f30457 100644
--- a/.github/workflows/publish-agb.yml
+++ b/.github/workflows/publish-agb.yml
@@ -26,8 +26,9 @@ jobs:
           API_TOKEN_GITHUB: ${{ secrets.API_TOKEN_GITHUB }}
         run: bash .github/scripts/update-template-repo.sh
 
+      - uses: extractions/setup-just@v1
       - name: Build the examples
-        run: bash .github/scripts/build-example-gba-files.sh
+        run: just build-roms
       - name: Upload examples to the release
         uses: svenstaro/upload-release-action@v2
         with:
@@ -40,8 +41,7 @@ jobs:
       - name: Install mdbook
         run: cargo install mdbook
       - name: Build the book
-        run: mdbook build
-        working-directory: book
+        run: just build-book
       - name: Deploy the book
         uses: JamesIves/github-pages-deploy-action@v4.2.5
         with:
diff --git a/.github/workflows/update-lockfiles.yml b/.github/workflows/update-lockfiles.yml
index c77b5d42..aca05925 100644
--- a/.github/workflows/update-lockfiles.yml
+++ b/.github/workflows/update-lockfiles.yml
@@ -18,4 +18,5 @@ jobs:
     - name: Check out repository
       uses: actions/checkout@v2
     - name: Update lock files
-      run: bash .github/scripts/update-lockfiles.sh
\ No newline at end of file
+      uses: extractions/setup-just@v1
+      run: just update-lockfiles
\ No newline at end of file
diff --git a/justfile b/justfile
new file mode 100644
index 00000000..0229f453
--- /dev/null
+++ b/justfile
@@ -0,0 +1,86 @@
+export CARGO_TARGET_DIR := env_var_or_default('CARGO_TARGET_DIR', justfile_directory() + "/target")
+
+build: build-roms
+
+test:
+    just _all-crates _test-debug
+
+clean:
+    just _all-crates _clean
+
+run-example example:
+    just _build-example "{{example}}"
+    mgba-qt "$CARGO_TARGET_DIR/thumbv4t-none-eabi/debug/examples/{{example}}"
+
+run-example-release example:
+    just _build-example-release "{{example}}"
+    mgba-qt "$CARGO_TARGET_DIR/thumbv4t-none-eabi/release/examples/{{example}}"
+
+run-game game:
+    (cd "examples/{{game}}" && cargo run --release)
+
+run-game-debug game:
+    (cd "examples/{{game}}" && cargo run)
+
+ci: && build-roms
+    just _all-crates _build
+    just _all-crates _test-debug
+    just _all-crates _test-release
+    just _all-crates _clippy
+
+build-roms:
+    just _build-rom "examples/the-purple-night" "PURPLENIGHT"
+    just _build-rom "examples/the-hat-chooses-the-wizard" "HATWIZARD"
+
+    just _build-rom "book/games/pong" "PONG"
+
+    (cd examples/target && zip examples.zip examples/*.gba)
+
+build-book:
+    (cd book && mdbook build)
+
+update-lockfiles:
+    bash .github/scripts/update-lockfiles.sh
+
+_build-rom folder name:
+    #!/usr/bin/env bash
+    set -euxo pipefail
+
+    GAME_FOLDER="{{folder}}"
+    INTERNAL_NAME="{{name}}"
+
+    GAME_NAME="$(basename "$GAME_FOLDER")"
+
+    TARGET_FOLDER="${CARGO_TARGET_DIR:-$GAME_FOLDER/target}"
+    GBA_FILE="$TARGET_FOLDER/$GAME_NAME.gba"
+
+    (cd "$GAME_FOLDER" && cargo build --release --target thumbv4t-none-eabi)
+
+    mkdir -p examples/target/examples
+
+    arm-none-eabi-objcopy -O binary "$TARGET_FOLDER/thumbv4t-none-eabi/release/$GAME_NAME" "$GBA_FILE"
+    gbafix -p "-t${INTERNAL_NAME:0:12}" "-c${INTERNAL_NAME:0:4}" -mGC "$GBA_FILE"
+
+    cp -v "$GBA_FILE" "examples/target/examples/$GAME_NAME.gba"
+
+_all-crates target:
+    for CARGO_PROJECT_FILE in agb-*/Cargo.toml agb/Cargo.toml examples/*/Cargo.toml book/games/*/Cargo.toml; do \
+        PROJECT_DIR=$(dirname "$CARGO_PROJECT_FILE"); \
+        just "{{target}}" "$PROJECT_DIR"; \
+    done
+
+_build crate:
+    (cd "{{crate}}" && cargo build)
+_test-release crate:
+    if echo "{{crate}}" | grep -qE '^agb'; then (cd "{{crate}}" && cargo test --release); fi
+_test-debug crate:
+    if echo "{{crate}}" | grep -qE '^agb'; then (cd "{{crate}}" && cargo test); fi
+_clippy crate:
+    if echo "{{crate}}" | grep -qE '^agb'; then (cd "{{crate}}" && cargo clippy); fi
+_clean crate:
+    (cd "{{crate}}" && cargo clean)
+
+_build-example example:
+    (cd agb && cargo build "--example={{example}}")
+_build-example-release example:
+    (cd agb && cargo build "--example={{example}}" --release)
\ No newline at end of file