The McLaren driver, out of contention for this year's title, complained that the road circuit was dusty and bumpy and that improvements promised last year had not been implemented.
Hamilton also hit out at changes made to the chicane on turn 10, where curbs had been built up.
"It's a lot worse than last year," Hamilton said. "Last year, it was a weird little corner anyway but it was quite good -- a quick left, right, left. Now it's big, fat curbs and there's no runoff, so it's very dangerous.
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Hamilton critical of Singapore course - ESPN