Slime Cross

About Slime Cross

Slime Cross turns Mendel's rules of inheritance into a short daily puzzle. Every slime carries two copies of each gene, one from each parent. In the classic daily there are three traits: colour (red over blue), horn (horned over hornless) and eyes (two eyes over one). The dominant copy is the one you see, so a red slime may be hiding a blue gene that only shows up in its offspring.

The daily challenge is numbered from its first day on 5 October 2026 and is picked from the date, so everyone playing on the same day gets the same starting slimes and the same target. You tap two slimes and press Cross to get four offspring; the same pair always gives the same litter, so crossing is an experiment with a fixed answer rather than a roll of the dice. The offspring join a family tree and can be crossed in turn. You have eight crosses, and every target needs at least three, because it mixes traits from different slimes and that takes two generations.

The game says the genes the target needs always appear somewhere among the starting slimes, so the puzzle can be solved by reasoning alone. Easy Mode shows the gene letters under each slime and lets you mark guesses, and Show answer plays the shortest route if you give up. When you finish, a share text shows each cross as a row of squares for how close each offspring came.

Beyond the daily, More options opens practice puzzles and harder versions with extra rules: purple from red and blue, a transparent gene that hides colour, a fourth gene for wings, slimes that can only cross twice, and a threat that kills slimes showing a trait. The game can be played in English, Portuguese and Japanese, needs no account, and suits players who like deduction puzzles with a bit of school biology in them.

How to play Slime Cross

1. Open slimecross.com and press Daily challenge; new players can take the two-minute Tutorial first.
2. Read today's target and the trait table, which shows which form of colour, horn and eyes is dominant and which is recessive.
3. Tap two slimes in the family tree and press Cross to get a litter of four offspring.
4. Use the offspring's looks to work out which hidden recessive genes their parents carry, and cross the offspring further.
5. Hatch a slime that matches the target in eight crosses or fewer, then copy or share your result.

Screenshots

Tips

• A recessive trait that appears in a litter proves both parents carry that recessive gene, even if neither shows it.
• Most targets need two generations: first breed a slime that carries the right hidden genes, then cross it to bring them out.
• The same pair always gives the same litter, so never cross the same two slimes twice.
• Turn on Easy Mode to see the gene letters and mark guesses such as V_ while you learn the rules.
• The practice versions with purple, transparent and wing genes are a good way to prepare for harder targets.

Questions