Winning at Flood Cube is not about clearing the board — a connected cube can always be reduced to a single colour eventually. It is about doing it inside the Par move budget. Every move either grows your controlled region a lot or a little, and the players at the top of the leaderboard are simply the ones who waste the fewest moves. This guide walks through how to think about that, from the one habit every beginner is missing to the tactics that separate a Gold medal from a near-miss.
The single most reliable heuristic in any flood-fill puzzle is greedy: each turn, choose the colour that adds the most new cells to your blob right now. On most cubes this alone will get you close to Par, and if you are new to the game it is the habit to build first. It works because a flood-fill board rewards momentum — the bigger your region, the more border it has, and the more a good colour choice can absorb.
But pure greed is short-sighted. The best solutions regularly include a move that looks weak — absorbing only a few cells — because it unlocks a much larger gain on the following turn. Think one move past the obvious: "if I take blue now, what does that make available next?" The gap between a greedy solver and an expert is almost entirely made of these setup moves.
This is the tip that transforms 2D flood-it players into 3D Flood Cube players. Because the grid wraps around all six faces, the colour that looks unremarkable on the front face may be dominant on the back and bottom. Beginners solve the three visible faces and then discover the hidden three are a mess. Get in the habit of spinning the cube fully before committing to a colour, so you are always choosing the move that helps across all six faces at once, not just the one you happen to be looking at.
Efficient solves are rarely an even outward bloom. Instead, aim to push a thread of your colour from the starting cell across the cube to the opposite side as early as you can. Once your region spans the cube — a "spine" — nearly every colour you pick afterwards absorbs chunks on multiple faces simultaneously, because your border now touches every region of the board. Spreading uniformly, by contrast, keeps your border small and local, and small borders make weak moves.
At the start of a large 9x9 cube, scan for any colour that appears only a handful of times. Picking a colour that only absorbs two or three cells is a "dead move" — you have spent one of your precious Par moves for almost nothing. Where you can, avoid selecting sparse colours early; let your main blob expand until those few cells are on your border and get swept up as part of a larger move. Conversely, if a sparse colour is the only bridge to a big untouched region, taking it early can be exactly the setup move that pays off.
An "island" is a clump of one colour completely surrounded by other colours, cut off from your blob. Islands are expensive: to claim them you must first flood right up to their border, then spend a move on their colour. When you plan a route, prioritise colour choices that connect you to islands as a side effect of a move you were going to make anyway — solving two problems with one turn. Ignoring islands until the end is how otherwise-good runs blow past Par in the last few moves.
Your leaderboard placement is your total moves across both cubes, with time as the tiebreaker — so a great result on the 8x8 opener can be undone by a sloppy 9x9. Treat the opener as a warm-up to read the day's colour distribution, then slow down and plan the 9x9. Because everyone plays the exact same pair each day, small move savings are what move you up the board.
The Challenge Cube seeds blank blocker cells that break up connections, so bridging across the cube matters even more. Your medal depends on the attempt on which you clear it, so use an early attempt to learn the board's shape and where the blockers sit, then commit to a clean solve.
Powerups are collected by fully surrounding them with your flood. Hold them for the moment they swing a run:
Ready to put it into practice? Play today's cube, brush up on the rules in How to Play, or read how flood-fill actually works for the theory behind these tactics.