Clues By Sam

Deductive logic only

A central mechanic of Clues by Sam is that guessing is never necessary and, in fact, is not permitted. Behind the scenes, a constraint solver evaluates whether a given assignment is logically certain based on available clues. If a player attempts to label someone whose status cannot be determined with certainty, the game blocks the move.^[3] As Ahvenniemi states in the game's instructions: "You cannot guess! Just like in real life, you can't convict someone based on a 50/50 hunch."^[4]

All clues in the game are truthful, even those given by criminals.^[4] Because wrong moves are blocked rather than merely penalised, players experience a fog-of-war in which the only path forward is the logically correct one.^[3]

Clue types and mechanics

Clues are expressed in natural language rather than game-specific symbols, allowing new players to begin without learning a dedicated rule set. Examples include statements such as "Column D has exactly three criminals" or "[Name] has three innocent neighbors."^[5] The game's vocabulary draws on spatial relationships (rows, columns, neighbors) and counts.

According to the official rules, "neighbors" always include diagonal neighbors, meaning any one card can have up to eight neighbors. The terms "to the left/right/above/below" refer to others in the same row or column. "Connected" denotes a chain of orthogonal adjacency; for example, "all criminals in row 1 are connected" means no innocents appear between any two criminals in that row.^[6] The game also notes that logical contraposition applies: a clue of the form "If A then B" implies "If not B then not A."^[6]

Difficulty

The puzzle difficulty follows the same weekly escalation as the New York Times crossword puzzle. Monday puzzles are classified as "Easy" and Tuesday's as "Medium", with the remainder of the week's puzzles categorised as "Tricky", "Hard", "Brutal", and "Evil". Ahvenniemi uses an internal tool called "The Solver" to generate objective difficulty metrics — such as the complexity of solving techniques required or how many clues must be held in mind simultaneously — but adjusts the final rating based on personal playtesting.^[7]

Accessibility features

The game includes several quality-of-life features: players can tap a clue to dim it once it has been used; names and professions referenced in clues are highlighted on the grid; rapidly tapping a clue causes the relevant cards to "bounce" for easier identification; and a color-blind mode is available.^[6] Players can also add color tags to any card to aid in tracking hypothetical deductions.

A hint system is available: the first hint reveals which clues should be examined, and the second hint reveals which persons can be identified next.^[6] A "Share scenario" feature allows players to share a link encoding their current puzzle state so others can help from exactly the same point.^[6]

Puzzle sharing

After completing the puzzle, players are shown their solve time and can share results as emoji grids, text, or images — similar to the sharing mechanic popularised by Wordle.^[8] Players who solve quickly may be told they rank in the top 1%, 5%, 10%, 25%, or 50% of solvers by speed for that puzzle.^[6]

New puzzles are released daily at midnight Eastern Time.^[4] The game is playable in a web browser on both desktop and mobile devices.

Background

Clues by Sam was created by Finnish game designer and programmer Johannes Ahvenniemi. He began coding in childhood, learning to program on his older brother's Amstrad computer. He received his first income from game design in 2007 through Flash games, which he described as providing important validation alongside modest financial reward.^[7]

Following the breakout success of Angry Birds in 2009 — developed by Rovio Entertainment, whose offices were near his own — Ahvenniemi joined Rovio as a junior developer. He subsequently worked at other mobile games companies, including Seriously Digital, where he was involved in Best Fiends. He spent approximately a decade in the mobile free-to-play games industry. He later described dissatisfaction with the high rate of project cancellations at venture-capital-funded studios, and ultimately left to work independently.^[7][9]

Papukaya

After leaving salaried employment, Ahvenniemi co-founded Papukaya, a Helsinki-based mobile games studio backed by Supercell, together with Drussila Hollanda and Tiago Rocha, in September 2020. Papukaya aimed to create novel game experiences for audiences who did not identify as traditional gamers. The studio produced over twelve prototypes and seven projects over three years before closing down.^[10]

Ad Artis Oy and Cluehound

In parallel, Ahvenniemi and his wife Vilma — an artist who had also worked in mobile games — founded Ad Artis Oy in 2020. The company originally focused on Cluehound, a line of physical puzzle magazines combining escape-room-style puzzles with murder mystery narratives, inspired by a session of an EXIT game outdoors during the COVID-19 pandemic. Cluehound magazines are designed and printed in Finland and sold internationally. The company also operates SudokuGen.com, a Sudoku puzzle website.^[11][7]

The success of the Cluehound magazines, along with attendance at conventions, led Ahvenniemi to conclude that crime, mystery, and puzzles are a broadly appealing combination when presented in accessible formats. This insight became a direct influence on the design philosophy of Clues by Sam.^[7]

Conception

In January 2025, while brainstorming puzzle ideas with his wife Vilma for the Cluehound magazine series, Ahvenniemi arrived at what he described as a "brilliant concept" that he felt was too good to abandon.^[1] This was further catalysed the following month when, while tracking the competition in the puzzle genre, he purchased a copy of the Murdle puzzle book. Although he enjoyed the book, he found the daily digital version of Murdle to involve too many user-experience trade-offs, particularly on mobile. Searching the App Store for competing games, he discovered Clue Master, a crime-themed grid puzzle. He identified what he considered significant design flaws in that game and determined exactly how to fix them in a single evening.^[7]

Ahvenniemi put his other projects on hold, and in May 2025 he launched Clues by Sam to the public. The game draws on puzzle-solving techniques from nonograms, Star Battle, and Fill-a-Pix, combined with a fog-of-war structure and natural-language clues inspired by the premise of Murdle.^[3]

The name "Sam"

The name "Sam" in the title does not correspond to the developer's real name. Ahvenniemi has explained that he was inspired by how Sid Meier attached his name to his games and by the studio name Toys for Bob, both of which he felt created a personal connection between creator and player. Because "Games by Johannes" did not fit well in a logo, he chose "Sam" — a short, friendly, gender-neutral, three-letter name — after noting that both "Sid" and "Bob" are three-letter words. He has also stated that the branding was part of a deliberate strategy: by releasing several small games under a recognisable name, any one success would increase the organic visibility of others in the portfolio.^[1][7]

Level generation

The most significant technical challenge in developing Clues by Sam was building the level generator. The generator must ensure that each puzzle has a narrow solve tree, presents non-trivial deductions, and is always solvable through logical techniques rather than extensive backtracking. Not every generated puzzle is used; Ahvenniemi curates the output to ensure a satisfying play experience.^[3]

Business model and other work

Clues by Sam is free to play. Ahvenniemi chose not to include advertising, drawing on his free-to-play industry experience to estimate that paid puzzle packs would be sufficient to supplement his income. He described this estimate as having proved accurate, marking his first time earning money from his own games since the Flash era. Revenue from puzzle pack sales has allowed him to increase the time spent improving the game.^[7][1]

Ahvenniemi has also developed other free puzzle games under the "Games by Sam" brand, including Bee Sort, Words by Sam, and Block Puzzle by Sam. Additionally, he has done freelance work for Netflix Puzzled, a daily puzzle platform developed in Helsinki, and has expressed interest in continuing that collaboration.^[7]

Player numbers

Clues by Sam launched in May 2025 with a small audience and grew steadily through word of mouth. By early 2026, the game had surpassed 50,000 daily active players. Ahvenniemi has described the growth as driven predominantly by organic sharing rather than marketing, resulting in what he characterised as an unusually engaged player base.^[1]

The largest single spike in daily player numbers came when Northernlion, a prominent YouTube and Twitch personality, played the puzzle on stream. Outside of such events, player counts show a regular weekly sawtooth pattern, reflecting the escalating difficulty across the seven days of the week.^[1]

Critical reception

Clues by Sam received coverage from several gaming and technology outlets. Boing Boing featured the game in October 2025.^[4] Aftermath named it among its writer's favourite daily puzzle games in November 2025, comparing it favourably to Wordle and its derivatives for rewarding logical thinking over guessing.^[8] The game was also listed by Kotaku^[12] and on the Thinky Games directory, and discussed on BoardGameGeek.^[13]

Web developer Dave Rupert wrote of the game: "It has a sudoku-like quality to it. Like the NYT crossword the difficulty scales up over the week and is a good way to burn 10 minutes... It makes me feel like the world's greatest detective sometimes."^[14]

Community

The game's community includes the Reddit community r/CluesBySamHelp, where players seek assistance with difficult puzzles. Discussion of the active daily puzzle is restricted on other subreddits, such as r/puzzles, to avoid spoilers.^[6]