What's the Password? has a simple concept: To solve each of the game's more than 100 puzzles, you have to type in the right four-digit password on a number pad. That might sound like a limited constraint. But the simplicity gives solo developer Dan DiIorio, better known as TrampolineTales, lots of room to play with clever ideas. Over the course of a few hours, the game never stopped surprising me.

Puzzle clues come in several different formats. Some are written text; the very first puzzle is a sentence that tells you what numbers to punch in. But you'll also have to decipher four-digit codes from things like the blinking digits of a clock, …

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