Hilo: A Word Puzzle Based on Binary Search Logic

Hilo applies binary search logic to word puzzles

Hilo is a daily word puzzle that replaces traditional word-game guessing with alphabetical deduction. Instead of focusing on whether a letter exists anywhere in a word, Hilo provides directional hints for each specific character position, effectively turning the process of finding a word into a binary search across the alphabet.

Core Gameplay Mechanics

Players must guess a seven-letter word within five attempts. After each guess, the game provides one of three hints for every letter position:

• Hi (↑): The target letter comes after the guessed letter in the alphabet.
• Lo (↓): The target letter comes before the guessed letter in the alphabet.
• Solve (✓): The guessed letter is an exact match for that position.

To assist the player, a range bar (e.g., F–Z) is displayed below each guess, visually representing the remaining possible letters for that specific position based on previous hints.

Strategic Shift from Traditional Word Games

Hilo shifts the challenge from vocabulary recall to logical deduction. While games like Wordle rely heavily on knowing which letters are common or finding words that contain specific letters, Hilo requires players to narrow down alphabetical ranges.

Community feedback highlights this distinction, with one user noting:

"My main issue with Wordle is that it feels like it's largely a question of chance, but this one feels like there's a lot more strategy involved."

User Feedback and Design Considerations

While the core concept is praised for its originality, early users have identified several areas for potential improvement regarding difficulty and accessibility:

Difficulty and Word Length

Many players found the seven-letter requirement challenging, noting that it is difficult to think of valid seven-letter words that also serve as effective "anchor points" for binary search. Suggestions for improvement include:

• Implementing a difficulty slider or "Normal" (5-letter) and "Master" (7-letter) modes.
• Increasing the number of allowed guesses.
• Adding a practice mode or an archive of previous daily puzzles.

User Interface and Accessibility

Users reported several friction points in the current interface:

• Visual Cues: Some players found the "up/down" arrows unintuitive, suggesting that "left/right" would better map to the horizontal range bars. Color-blind users also noted that the contrast on the arrows is insufficient.
• Input Controls: Several users struggled to find the "Go" button on mobile devices, noting it was not sufficiently highlighted within the virtual keyboard.
• Keyboard Logic: Feedback suggests that the virtual keyboard colors should update dynamically based on the current letter slot being typed to show which letters are still valid for that specific position.

Technical Observations

Some users noted issues with the word list and definitions, including instances where common words were flagged as "Not in the word list" and cases where the post-game definition provided an obscure secondary meaning rather than the primary usage of the word.