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Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
LEGO's request form asks for the set number (DOTS-SERIES-6) and each piece's element ID, both listed above.
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Tile Round 1 x 1 with 'PLAYER ONE' Print
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Tile Round 1 x 1 with 'PLAYER TWO' Print
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Tile Round 1 x 1 with Clapping Hands on Medium Azure Background Print
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Tile Round 1 x 1 with Dark Pink Angry Face, Raised Eyebrow Print
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Tile Round 1 x 1 with Lavender Donut, Sprinkles, Face Print
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Tile Round 1 x 1 with Lavender Sea Star on Medium Azure Background Print
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Tile Round 1 x 1 with Lavender UFO, Abduction Ray Print
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Tile Round 1 x 1 with Medium Azure Hand, Finger Snap, Heart on Bright Light Yellow Background Print
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Tile Round 1 x 1 with Speech Bubble, Dark Pink 'ciao!' on Medium Azure Background Print
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Tile Round 1 x 1 with Speech Bubble, Medium Azure 'HOLA!' on Lavender Background Print
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Tile Round 1 x 1 with Yellow Face, Lavender Eye Mask, Drool Print
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Tile Round 1 x 1 with Yellow Happy Face Print
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Tile Round 1 x 1 with Yellow Wink, Smile Face Print
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Tile Round 1 x 1 with Yellow/Yellowish Green/Dark Turquoise Banana on Dark Pink Background Print
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Tile Round 1 x 1 with Yellowish Green Alien Face Print
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Tile Round 1 x 1 with Yellowish Green Queasy Face Print
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Tick each piece as you find it, or mark it missing.
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.
Request a replacement from LEGOMark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.
