Ring City
Watch a megastructure city rise over 20 years

Learn to tie a tie step by step in 3D

sael.net

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Interactive 3D guide to tying a tie step by step, one move at a time, for the four-in-hand, half Windsor and Windsor knots. Each step names the move, such as across, behind, up through and tuck, and draws the wide end's next move as a glowing path. Users can drag the tie themselves and watch it in a mirror, face to face, or looking down as at their own tie. The builder says AI made it with just code and no Blender or 3D assets.

Cut costs in a UK budget simulator

britains-disk.pages.dev

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Interactive view of 2025-26 UK public spending as a disk cleanup, where £1,360.1bn of spending sits on a disk sized to £1,231.3bn of receipts. Players delete or shrink line items in 10% steps across folders such as social protection, health, education and defence until the £128.8bn gap closes, while debt interest stays fixed. A treemap shows what is left, figures come from HM Treasury, and the builder vibe coded this government spending game.

Generate a quiz on any topic and play it

intelliquiz.xyz

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Quiz maker that generates multiple-choice or true/false quizzes on any topic, with a survival mode that keeps going until a wrong answer. Players set the question count, easy or hard difficulty and public visibility, and can browse community quizzes, dailies and a leaderboard; free use has a monthly quiz limit, with more on a paid tier. The builder describes it as vibe coded.