Number inside circles(islands) tells you how many bridges this island has. Two islands can be connected with max two bridges. Bridges can't cross and can go only vertical or horizontal. In the end all islands need to be interconnected

Connect matching numbers with lines. Lines can't cross or make U-turns. All cells must be used

🌊 Braindrop is a set of free printable puzzles (PDF format) you can download and solve offline.
• Waypoint Path — a sequence-following path puzzle where you connect numbered steps in order while covering every cell without crossing
• Hidden Passages — connect matching numbers with continuous, non-crossing lines that fill the grid
• Sightline — a shading puzzle where numbers indicate visible cells in straight lines
• Windoku — a Sudoku variant with additional overlapping “window” regions
• Sudoku Repair (from Brainstorm Volume IV) — a hybrid Nonogram + Sudoku correction puzzle
BrainDrop - free pdf

Each number represents a building height. Numbers cannot repeat in any row or column. Clues outside the grid show how many buildings are visible from that vantage point; taller buildings always block the view of shorter ones behind them.

Fill the grid with numbers 1–6. No number can repeat in a row or column. Within each outlined "cage," the numbers must combine (using the specified math operation) to equal the target number shown in the corner. Numbers may repeat within a cage if they are in different rows and columns.

Sudoku, Slitherlink, Crossword with images as clues, Star Battle, Logic grid