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The ▲ is upvote — push up comments you like.
Just below sit a round ⓘ button and a switch labeled "Assist". The "Assist" switch is this assist itself — turn it off and the guides disappear, leaving the plain screen identical to the real Hacker News. Once you are comfortable, switch it off and graduate to the real thing. The ⓘ opens an explanation of what this site is for. Use the 「日本語」 link at the top-right to switch the display language.
