How to play
Five comparisons per level. Get four right to unlock the next; progress is saved on this device.
150 levels get harder as the player counts get closer. Daily and practice games have ten comparisons.
Where the player counts come from
Every number is a concurrent player count from Steam’s official Web API (GetNumberOfCurrentPlayers), requested for 343 games in a single capture. The date and time of that snapshot appear under the game, and every round, level and daily challenge uses the same snapshot, so the answers do not drift while you play. A count is how many people were in the game at that moment — not sales, owners or a daily peak. In the current snapshot Counter-Strike 2 leads with more than a million players, while some titles had fewer than a hundred.
How the 150 levels get harder
Each level is a fixed set of five comparisons, and the levels come in five bands of 30. In levels 1–30 one game in every pair has more than eight times the players of the other. From level 31 the gap is three to eight times, from level 61 between 1.7 and three times, and from level 91 between 1.15 and 1.7 times. In the last 30 levels the two counts are within 15% of each other. No game appears twice within a level, and pairs with identical counts are never used.
You need four correct answers out of five to unlock the next level. The level menu shows your best score for each level you have played, and you can replay any unlocked level to improve it.
Daily challenge and practice
The daily challenge and practice runs have ten comparisons: two from each difficulty band, from the easiest to the closest. The daily set is the same for everyone and changes at 00:00 UTC; practice deals a new set each time. Your best result in these modes is kept on this device. The results screen lists every pair with both numbers, which is a quick way to learn which titles are bigger than they look.
Tips
Think in ratios rather than raw differences: going from 2,000 to 20,000 players is a far bigger jump than going from 100,000 to 120,000. Long-running free-to-play multiplayer games tend to hold large audiences, while story-driven single-player games often quieten down once most people have finished them. The capture time matters too, because the same game can look very different at another hour of the day. For more Steam trivia, try Guess the Steam Game by Reviews or Guess the Steam Game by Stats, and test your Counter-Strike knowledge in the CS2 Map Quiz.

