Comparison

Cold Case Bureau vs ONE KILLER LEFT

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Cold Case Bureau

Engage in a slow-paced mystery game where you analyze case files, evidence, and suspect testimonies to uncover contradictions. Piece together clues on your investigation board to solve crimes and advance your detective career through increasingly challenging tiers.

Highlights
  • Analyze case files and evidence
  • Identify contradictions in testimonies
  • Use an investigation board
  • Progress through difficulty tiers
  • Offline play
  • Reputation system
Read full description

One case a day. The same case for everyone. Nothing to buy, no ads, no account. Cold Case Bureau puts a case file on your desk: the victim, the suspects, the evidence, and somewhere inside it, one story that doesn't hold together. Read the file. Find the two statements that can't both be true. Pin them on the board and watch the string pull tight. Then build your theory, not a guess from a menu, but an argument, element by element. Get part of it right and that part locks in. Get part of it wrong and the case tells you exactly which part, and lets you keep working. THE DAILY CASE Every day the Bureau opens one case, and it's the same case for every player in the world. Solve it, keep your streak alive, and share your result. A spoiler-free grid that shows how you did without giving anything away. INVESTIGATE Four Case Hours, and a case that offers more than four hours of leads. Press a suspect with a piece of evidence and what they say depends on what you chose to show them. Pull records nobody asked for. Send evidence to the lab. Earn a warrant with proof from your board. A wasted half hour is on you, but the case can always be closed from the file alone. Nothing is ever locked behind a guess. THE INVESTIGATION BOARD Real red string. Connect two pieces of evidence that contradict each other and the connection is established permanently. The board is where you prove people are lying. THE ARCHIVE More than ninety past Daily cases, free to work in any order, from quick Rookie files to five-suspect Senior investigations with paper trails that close like a net. FAIR PLAY, GUARANTEED Every case is verified solvable from its own evidence before it ships. Every question has exactly one answer the file supports. If you reason correctly, you win - that's the whole promise. No ads. No purchases. No timers that want your money. Just cases.

About

ONE KILLER LEFT

Features
Read full description

A name hidden among thousands. No luck, no shortcuts: every clue is a verifiable fact, and only one person fits them all. ONE KILLER LEFT is a pure deduction game, inspired by the mass-elimination mystery books taking off worldwide. Read the clues, cross out whoever doesn't fit, and keep going until only one name remains. FOUR LEVELS, FOUR CHALLENGES · Easy (~100 names) — learn the mechanic in 10 minutes. · Medium (~500 names) — now you're cross-referencing multiple clues at once. · Hard (~2,000 names) — for players who want a real challenge. · Impossible Case (40,000 names) — the flagship mode. This won't be solved in one sitting: your progress saves itself, and you can come back anytime until it's cracked. CASE OF THE DAY A new case every day, the same one for everyone. Compete with yourself, compare results with friends, keep your streak alive. NO SHORTCUTS, UNLESS YOU CHOOSE THEM In the smaller levels, everything is done by hand — like a book and a pencil. In the Impossible Case, you can apply automatic discards if you prefer, but solving it 100% by hand earns its own reward: a badge that shows it. NO ACCOUNT, NO SIGN-UP Just open the app and play. Your progress, rank, and streak are saved right on your device. Do you dare take on 40,000?

Screenshots

Cold Case Bureau4 screens
ONE KILLER LEFT3 screens

Verdict

The call

The clearest difference is in-app purchases: Cold Case Bureau at none against ONE KILLER LEFT's 2. Cold Case Bureau also leads on ads (none vs shown). ONE KILLER LEFT's advantage is update cadence (every 4 days vs every 2 months) and device support (3 vs 1). On price there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ONE KILLER LEFT sells 2 one-off in-app purchases. Cold Case Bureau asks for nothing beyond the download.

UpkeepUpdate frequency

Cold Case Bureau ships an update every 2 months, ONE KILLER LEFT every 4 days. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

Scorecard5 real differences · 5 level
Cold Case Bureau versus ONE KILLER LEFT: the parameters behind the verdict, then further details
ParameterCold Case BureauONE KILLER LEFT
PriceFreeFree
Rating4.1 (8 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings8 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size21 MB41 MB
Age rating12+9+
DeveloperThomas MastersRICARDO GONZALEZ ESCALERA

In-app purchases

None

Cold Case Bureau

No in-app purchases

2 purchases

ONE KILLER LEFT

One-time2
  • 5 Discards$0.99
  • Remove Ads$2.99

Questions

Is Cold Case Bureau free?
Cold Case Bureau is free to download, with no in-app purchases.
Is ONE KILLER LEFT free?
ONE KILLER LEFT is free to download, with in-app purchases available.
Do Cold Case Bureau or ONE KILLER LEFT have ads?
ONE KILLER LEFT shows ads; Cold Case Bureau does not.
Which is updated more often, Cold Case Bureau or ONE KILLER LEFT?
Cold Case Bureau ships an update every 2 months, and ONE KILLER LEFT every 4 days. Most recently, Cold Case Bureau was updated on October 6, 2026 and ONE KILLER LEFT on October 8, 2026.

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