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Puzzle 1
What comes next in this sequence:
dog · goat · tarantula · aardvark · koala · ?
Choose from:
cat, mouse, antelope, elephant, frog
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Puzzle 2
Can you make this equation correct by moving exactly one matchstick?

Note: this puzzle is not interactive, and the matchsticks cannot be moved. The matchstick layouts for each digit are:
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Puzzle 3
What comes next in this sequence:
boron · carbon · nitrogen · oxygen · ?
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Puzzle 4
Can you make this equation correct by moving exactly one matchstick?

Note: this puzzle is not interactive, and the matchsticks cannot be moved. The matchstick layouts for each digit are: