diff --git a/src/cmd/metroidbuildinfo.rs b/src/cmd/metroidbuildinfo.rs
new file mode 100644
index 00000000..0491b104
--- /dev/null
+++ b/src/cmd/metroidbuildinfo.rs
@@ -0,0 +1,48 @@
+use std::path::PathBuf;
+
+use anyhow::{Context, Result, bail, ensure};
+use argp::FromArgs;
+use memchr::memmem;
+use memmap2::MmapOptions;
+
+#[derive(FromArgs, PartialEq, Eq, Debug)]
+/// Sets the MetroidBuildInfo tag value in a given binary.
+#[argp(subcommand, name = "metroidbuildinfo")]
+pub struct Args {
+    #[argp(positional)]
+    /// path to source binary
+    binary: PathBuf,
+    #[argp(positional)]
+    /// path to build info string
+    build_info: PathBuf,
+}
+
+const BUILD_STRING_MAX: usize = 35;
+const BUILD_STRING_TAG: &str = "!#$MetroidBuildInfo!#$";
+
+pub fn run(args: Args) -> Result<()> {
+    let build_string = std::fs::read_to_string(&args.build_info).with_context(|| {
+        format!("Failed to read build info string from '{}'", args.build_info.display())
+    })?;
+    let build_string_trim = build_string.trim_end();
+    let build_string_bytes = build_string_trim.as_bytes();
+    ensure!(
+        build_string_bytes.len() <= BUILD_STRING_MAX,
+        "Build string '{build_string_trim}' is greater than maximum size of {BUILD_STRING_MAX}"
+    );
+
+    let binary_file =
+        std::fs::File::options().read(true).write(true).open(&args.binary).with_context(|| {
+            format!("Failed to open binary for writing: '{}'", args.binary.display())
+        })?;
+    let mut map = unsafe { MmapOptions::new().map_mut(&binary_file) }
+        .with_context(|| format!("Failed to mmap binary: '{}'", args.binary.display()))?;
+    let start = match memmem::find(&map, BUILD_STRING_TAG.as_bytes()) {
+        Some(idx) => idx + BUILD_STRING_TAG.len(),
+        None => bail!("Failed to find build string tag in binary"),
+    };
+    let end = start + build_string_bytes.len();
+    map[start..end].copy_from_slice(build_string_bytes);
+    map[end] = 0;
+    Ok(())
+}
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
index 2162501b..284c4f18 100644
--- a/src/cmd/mod.rs
+++ b/src/cmd/mod.rs
@@ -8,6 +8,7 @@ pub mod elf;
 pub mod elf2dol;
 pub mod extab;
 pub mod map;
+pub mod metroidbuildinfo;
 pub mod nlzss;
 pub mod rarc;
 pub mod rel;
diff --git a/src/main.rs b/src/main.rs
index 5f6e6b5a..4333df7c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -98,6 +98,7 @@ enum SubCommand {
     Elf2Dol(cmd::elf2dol::Args),
     Extab(cmd::extab::Args),
     Map(cmd::map::Args),
+    MetroidBuildInfo(cmd::metroidbuildinfo::Args),
     Nlzss(cmd::nlzss::Args),
     Rarc(cmd::rarc::Args),
     Rel(cmd::rel::Args),
@@ -176,6 +177,7 @@ fn main() {
         SubCommand::Elf2Dol(c_args) => cmd::elf2dol::run(c_args),
         SubCommand::Extab(c_args) => cmd::extab::run(c_args),
         SubCommand::Map(c_args) => cmd::map::run(c_args),
+        SubCommand::MetroidBuildInfo(c_args) => cmd::metroidbuildinfo::run(c_args),
         SubCommand::Nlzss(c_args) => cmd::nlzss::run(c_args),
         SubCommand::Rarc(c_args) => cmd::rarc::run(c_args),
         SubCommand::Rel(c_args) => cmd::rel::run(c_args),