Color Flood: Odyssey

Where Color Flood: Odyssey comes from

Every flood puzzle descends from a tool, not a game: the paint bucket, the fill command that has sat in drawing programs since the 1970s and works by spreading outward from a starting pixel through every neighbor that matches. Turn that spread into a move, hand the player a corner and a palette, and you have Flood-It — the small tapping game that spread across phones at the end of the 2000s and asks you to swallow the entire board in as few floods as you can. It looks like a toy and it is not: computer scientists proved in 2010 that playing it optimally is NP-hard, even with the whole board in front of you and nothing hidden. Our version keeps the move and changes what winning means. You are not conquering the grid, you are crossing it. The ship is Odysseus's, moored at the top-left port; Ithaca is the far bottom-right corner; and you win the moment an unbroken chain of sea tiles links the two, up and down and across but never diagonally. The rest of the map can stay any color it likes. Homer supplied the furniture — the wine-dark sea, Scylla and Charybdis, the Cyclops, the Sirens, all of them reefs you cannot flood — and the puzzle supplied the cruelty: a move budget, so this is one of the very few flood games you can actually lose.

How to get better at Color Flood: Odyssey

Do not spend blue early. Sea is the scarcest terrain on the map and the only color that can finish the job, because the last move of any solve is necessarily sea. A blue tile you swallow on move three to gain a little ground is a blue tile that is not there on move twenty when you need one final link into Ithaca. Push through the browns and the greens and save the water for the road.

Find the road before you take the first tile. There is almost always one obvious channel of sea and near-sea running corner to corner, and the reefs are what decide whether it exists at all. Trace it with your eye first, then flood toward it. Flooding at Ithaca instead of at the route is the single most common way a solve drifts over par.

Read the swatches, not the board. You can only play a color already touching your region, so half the board is unavailable on any given turn — the swatches dim when their color is out of reach, and the takeable tiles are ringed. Every move rearranges which doors are open, and a color that was live two turns ago may have quietly closed behind you.

Know which number is which. Par is the scoring target and sits just under strong play; the budget above the grid is the hard ceiling. You can miss par and still get home, banking no bonus. You cannot miss the budget. Playing for par means planning a line; playing for the budget means improvising, and improvising is what runs it out.

Let the week set the difficulty. There is nothing to choose — Monday is a calm nine by nine, the midweek boards open up, and Sunday hands you a wine-dark sixteen by sixteen and the longest way home. The temples above the grid show where the day sits out of five. Undo is free while you are signed in, and three a day otherwise, so on the big boards it is cheap to test a line rather than commit to it.

A round in the life

Thursday: rough water, thirteen by thirteen, and Poseidon is not yet watching but he is awake. The route reads almost immediately — a green corridor running down the left flank, then a hard turn east through a gap between two reefs, with real sea only in the last third. So you ignore Ithaca entirely and pour yourself down the flank, four moves of green and brown that gain nothing visible and open everything. The gap is narrower than it looked; one of those reefs turns out to be Charybdis, which you take personally. Around move eleven the region finally touches water and the swatch lights up, and you make yourself not take it — there is one more brown step that has to happen first, and taking the sea now would leave the chain a tile short of the corner. Twelve, thirteen, and then the blue, and the road closes with three moves still in the budget. Under par by two. Odysseus has been slower.