What does 頭爆発 look like on Google?

On Google it is the design shipped in 17.0, shown above at full size. Older revisions are listed beneath it.

When did Google add 頭爆発?

Google first drew 頭爆発 in Android 8.0, released 2017年8月21日.

Google LLC has shipped 15 versions of 頭爆発. Each is dated, so you can see when the design changed.

Google Android 8.1

This is the design Google introduced in Android 8.0, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does 頭爆発 look like on Google?: On Google it is the design shipped in 17.0, shown above at full size. Older revisions are listed beneath it.
When did Google add 頭爆発?: Google first drew 頭爆発 in Android 8.0, released 2017年8月21日.
How many times has Google redrawn 頭爆発?: Google LLC has shipped 15 versions of 頭爆発. Each is dated, so you can see when the design changed.