diff --git a/build.ps1 b/build.ps1
new file mode 100644
index 0000000..f8c174b
--- /dev/null
+++ b/build.ps1
@@ -0,0 +1,52 @@
+$ErrorActionPreference = "Stop"
+
+$PROJECT = "sindri"
+$COMMIT = git rev-parse --short HEAD
+$VERSION = "dev-$(Get-Date -Format 'yyyy-MM-dd')-$COMMIT"
+
+$OPTION = $args[0]
+if ($args) { $args = $args[1..($args.Length - 1)] } else { $args = @() }
+
+# ------------------------------------------
+# Game compile
+
+New-Item -ItemType Directory -Force -Path build | Out-Null
+
+# Game.dll
+odin build game/ -show-timings `
+	-collection:sindri=src `
+	-build-mode:dynamic `
+	-out:build/game_tmp -microarch:native "-define:VERSION=$VERSION-debug" -debug @args
+
+# Need to use a temp file on Windows because it first writes an empty file,
+# which the engine will load before it is actually fully written.
+if (-not (Test-Path "build/game_tmp.dll")) {
+	Write-Error "error: build produced no game lib.dll"
+	exit 1
+}
+Move-Item -Force "build/game_tmp.dll" "build/game.dll"
+
+# ------------------------------------------
+# Engine compile
+
+# If the executable is already running, then don't try to build and start it.
+$proc = Get-Process -Name $PROJECT -ErrorAction SilentlyContinue
+if ($proc) {
+	Write-Output "Hot reloading..."
+	exit 0
+}
+
+if ($OPTION -eq "debug") {
+	odin build src/ -show-timings `
+		-collection:sindri=src `
+		-collection:gram=vendor/gram/src `
+		-collection:wgpu=vendor `
+		-out:build/$PROJECT -microarch:native -use-separate-modules "-define:VERSION=$VERSION-debug" -debug @args
+	exit 0
+}
+
+odin build src/ -show-timings `
+	-collection:sindri=src `
+	-collection:gram=vendor/gram/src `
+	-collection:wgpu=vendor `
+	-out:build/$PROJECT -microarch:native -o:speed "-define:VERSION=$VERSION" @args