The full logical solve of the hard LITS for September 8 to September 14, 2026, 10 × 10. 50 steps, 6 techniques, no guessing. Step through it, or jump to any step below.
Every tetromino that still fits in this region covers r2c2, r3c2 and r4c2.
Every tetromino that still fits in this region covers r3c6, r4c6, r4c7 and r5c7. Only one fit is left: an S.
Every tetromino that still fits in this region covers r6c6 and r6c7.
Every tetromino that still fits in this region covers r9c10.
Every tetromino that still fits in this region covers r9c3 and r9c4.
Every tetromino that still fits in this region covers r10c2 and r10c3.
Every tetromino that still fits in this region covers r10c6, r10c7 and r10c8.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region misses r2c1 and r3c1.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region misses r3c7.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r2c9 and r3c9, and none covers r5c8.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r5c4 and r6c4, and none covers r2c5 and r3c5.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r5c9, and none covers r2c10.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r6c2 and r7c2, and none covers r9c2.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r1c4, and none covers r4c1, r5c1, r6c1, r7c1 and r8c1.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r6c8, and none covers r5c6.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r8c6 and r8c7.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r9c1 and r10c1, and none covers r10c4 and r10c5. Only one fit is left: an L.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r1c3, and none covers r3c3.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region misses r5c3.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r8c4.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region misses r8c3.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r8c2.
Fits that leave a neighbouring region no tetromino that works beside them are out. Every fit left in this region covers r4c3, and none covers r2c3. Only one fit is left: an L.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region misses r4c5.
Fits that leave a neighbouring region no tetromino that works beside them are out. Every fit left in this region covers r5c10 and r6c9, and none covers r3c10 and r8c9.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region misses r6c10.
Fits that leave a neighbouring region no tetromino that works beside them are out. Every fit left in this region misses r4c8.
Fits that leave a neighbouring region no tetromino that works beside them are out. Every fit left in this region covers r8c10, and none covers r8c8 and r9c8.
Suppose r5c2 is left white. Following the rules from there, a region would have no tetromino that fits. So it is shaded.
Every tetromino that still fits in this region misses r7c3.
Suppose r6c3 is left white. Following the rules from there, a region would have no tetromino that fits. So it is shaded.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region misses r4c4.
Suppose r4c9 is shaded. Following the rules from there, a 2×2 block would be shaded. So it is white.
Every tetromino that still fits in this region covers r1c9.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r1c7.
Suppose r2c4 is shaded. Following the rules from there, a region would have no tetromino that fits. So it is white.
Every tetromino that still fits in this region covers r1c1 and r1c2, and none covers r3c4. Only one fit is left: an I.
Fits that would cut some shading off from the rest are out. Every fit left in this region covers r2c6, r2c7 and r2c8, and none covers r1c5, r1c6 and r1c8. Only one fit is left: a T.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r1c10, and none covers r3c8. Only one fit is left: an L.
Suppose r4c10 is left white. Following the rules from there, a 2×2 block would be shaded. So it is shaded.
Every tetromino that still fits in this region misses r7c9.
Fits that would cut some shading off from the rest are out. Every fit left in this region covers r10c9, and none covers r9c6. Only one fit is left: an I.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r7c10.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r9c9, and none covers r10c10. Only one fit is left: an L.
Fits that would cut some shading off from the rest are out. Every fit left in this region covers r9c7, and none covers r7c5.
Suppose r7c4 is left white. Following the rules from there, a region would have no tetromino that fits. So it is shaded.
Every tetromino that still fits in this region misses r5c5.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r8c5, and none covers r9c5. Only one fit is left: an S.
Fits that would touch a tetromino of the same shape next door are out. Every fit left in this region covers r7c7, and none covers r7c6. Only one fit is left: a T.
Fits that would finish a 2×2 block of shading are out. Every fit left in this region covers r6c5, and none covers r7c8. Only one fit is left: an I.