Top 10 Hardest Riddles to Solve! Mind Blowing

Sharpen your brain with the best riddles for quick brains only. Test your logical thinking with this set of brain boosting riddles. Start solving puzzles every day to sharpen your logic and increase your IQ. Hard riddle

00:21 What English word has three consecutive double letters?
1:12 You can carry it everywhere you go, and it does not get heavy. What is it?
2:03 What has may keys, but can't even open a single door?
2:55 What disappears as soon as you its name?
3:53 What comes once in a minute, twice in a moment, but never in a thousand years?
4:46 I have keys but no locks. I have space but no rooms. You can enter but you can"t go outside. What am I?
5:38 What is seen in the middle of March and April than cant"t be seen at the beginning or end of either month?
6:31 A seven letter word containing thousands of letters.
7:24 I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?
8:18 I always run but never walk. I sometimes sing but cannot talk. No head on which a hat to place. You always look me in the face. What am I?