The top row, and most of the second row is revealed. The player has to click a lot of lizards. The left and right columns are random*, and revealed. The player never has to click them, those lizards don't count.
(The game generates an 11x11 grid, and discards the outer edges, and the top half. The bottom 9x6 center area is revealed. This ensures the grid is fair.)
The difficulty is influenced by the number of items revealed, and the number of lizards the player has to find.
A cellular automata (https://en.wikipedia.org/wiki/Elementary_cellular_automaton) with lizards (0), and fish (1). Rules:
51, 170, 204 (easy)
54, 60 (medium)
30, 184, 90, 110 (hard)
(others: 18, 22, 26, 30, 41, 45, 54, 60, 90, 105, 106, 110, 122, 126, 146 and 150)
The rule can also be inverted or flipped, so there are actually 16 possible rules for hard mode.
The top row, and most of the second row is revealed. The player has to click a lot of lizards. The left and right columns are random*, and revealed. The player never has to click them, those lizards don't count.
(The game generates an 11x11 grid, and discards the outer edges, and the top half. The bottom 9x6 center area is revealed. This ensures the grid is fair.)
The difficulty is influenced by the number of items revealed, and the number of lizards the player has to find.