ThePuzzleLabs

Free printable Aquarium worksheets

185 print-ready PDF packs across five difficulty levels — 8 puzzles per pack with tank boundaries drawn in thick black and row/column water clues on the edges, plus a full answer key showing every filled cell. Download and print. No signup, no ads.

Easy Aquarium

6×6 grids. Learn how water levels and tank boundaries interact.

Pack 01Pack 02Pack 03Pack 04Pack 05Pack 06Pack 07Pack 08Pack 09Pack 10Pack 11Pack 12Pack 13Pack 14Pack 15Pack 16Pack 17Pack 18Pack 19Pack 20Pack 21Pack 22Pack 23Pack 24Pack 25Pack 26Pack 27Pack 28Pack 29Pack 30Pack 31Pack 32Pack 33Pack 34Pack 35Pack 36Pack 37

Medium Aquarium

8×8 grids. Forced-level and zero-clue deductions become useful.

Pack 01Pack 02Pack 03Pack 04Pack 05Pack 06Pack 07Pack 08Pack 09Pack 10Pack 11Pack 12Pack 13Pack 14Pack 15Pack 16Pack 17Pack 18Pack 19Pack 20Pack 21Pack 22Pack 23Pack 24Pack 25Pack 26Pack 27Pack 28Pack 29Pack 30Pack 31Pack 32Pack 33Pack 34Pack 35Pack 36Pack 37

Hard Aquarium

10×10 grids. Multiple tanks per row demand careful elimination.

Pack 01Pack 02Pack 03Pack 04Pack 05Pack 06Pack 07Pack 08Pack 09Pack 10Pack 11Pack 12Pack 13Pack 14Pack 15Pack 16Pack 17Pack 18Pack 19Pack 20Pack 21Pack 22Pack 23Pack 24Pack 25Pack 26Pack 27Pack 28Pack 29Pack 30Pack 31Pack 32Pack 33Pack 34Pack 35Pack 36Pack 37

Expert Aquarium

12×12 grids. Long deduction chains across overlapping tanks.

Pack 01Pack 02Pack 03Pack 04Pack 05Pack 06Pack 07Pack 08Pack 09Pack 10Pack 11Pack 12Pack 13Pack 14Pack 15Pack 16Pack 17Pack 18Pack 19Pack 20Pack 21Pack 22Pack 23Pack 24Pack 25Pack 26Pack 27Pack 28Pack 29Pack 30Pack 31Pack 32Pack 33Pack 34Pack 35Pack 36Pack 37

Einstein Aquarium

15×15 grids at the highest tier. Logic-only certified — no guessing.

Pack 01Pack 02Pack 03Pack 04Pack 05Pack 06Pack 07Pack 08Pack 09Pack 10Pack 11Pack 12Pack 13Pack 14Pack 15Pack 16Pack 17Pack 18Pack 19Pack 20Pack 21Pack 22Pack 23Pack 24Pack 25Pack 26Pack 27Pack 28Pack 29Pack 30Pack 31Pack 32Pack 33Pack 34Pack 35Pack 36Pack 37

About these worksheets

Each PDF is three pages: two pages of puzzle grids (four per page, with the tanks outlined in thick black and the row/column clue counts in the margin strips) followed by a full answer key where the water cells are filled in light grey. All puzzles are computer-verified to have a unique solution.

Packs are numbered sequentially within each difficulty. Pack 01 contains puzzles 1–8, Pack 02 contains puzzles 9–16, and so on up to Pack 37 (puzzles 289–296). Each difficulty has 300 distinct puzzles total.

If you'd rather solve interactively, play online with hints and step-by-step solutions. Or read the Aquarium rules guide to learn the gravity and clue mechanics.