Supposedly you have to shoot the containers open, while not destroying them and eventually one of them will drop the 1UP, or something. I've never been able to pull it off though.
Any tips are welcome.
It states that it has two score-based extends and then elaborate in a footnote that (supposedly) there is an 1-up item that can be collected in the bonus stage.That website simply states that you can get the score extend at 1.5mil
If it was just saying that the bonus stage is a good spot to earn the extends, it wouldn't mention that you can get three extends there, because there are only two score-based extends.エクステンドは50万と150万、そして5面でチャンスがある*2。
Extend offers chances at 500,000 and 1,500,000 points, and on Stage 5*2.
*2 コンテナを破壊した際に出るアイテムが6つ目で出る。うまくやればこのステージで三機ほどエクステンドも可能だが、出すには少々コツがいる
The sixth item appears when you destroy the container. With skill, you can get about three extends on this stage, but it takes a bit of practice to pull off.

The entire site doesn't mention the 1-Up item anywhere (or have I missed it?!) but the footnote (probably?) still implies it with the 3 extends gained from stage 5. It's pretty strange wording which only tells me that the author of the page doesn't know how to get it. Maybe.It states that it has two score-based extends and then elaborate in a footnote that (supposedly) there is an 1-up item that can be collected in the bonus stage.
The last sentence here is the most important maybe. However that item may be triggered, fortunately it's not really needed.このステージにエクステンドアイテムが存在します。
コンテナは半壊状態になるとボーナスチップをばらまきますが、これが5個目か6個目になると1UPに変化するのです。
(コンテナ自体は特定のものではなく、どれであっても問題ない)
出し方のコツとしては、画面下右よりから出現するコンテナに出現前からアーマー形態のマズルフラッシュを突っ込ませて半壊状態にし、そのままを見送るだけでよいでしょう
ただ、コンテナが出現した後半壊状態にして1UPが出るまで待つとコンテナはまず画面外へと出てしまい、まずパーフェクトは取れません。
もし、スコア狙いであれば、取る必要はないかと思われます。
