Logic
Block Puzzle is a spatial planning game, place three block shapes on a 10×10 grid and clear full lines.
Block Puzzle in MyRin gives you three block shapes at a time. Drag each one onto a 10×10 board to place it. When a complete row or column is filled, it clears and opens space. The objective is to clear enough lines to reach the level target before the board runs out of room.
Unlike Tetris, pieces don't fall, you place them where you choose. Unlike Sudoku, there's no single solution derived by logic. Block Puzzle is a spatial planning game: the question is always "where should these three pieces go to leave the board in the best possible state?"
The most important strategic rule in Block Puzzle is this: plan all three pieces before placing any of them. This sounds obvious but almost no new player does it, the natural impulse is to place the piece that fits most obviously, then deal with the next two.
The problem with single-piece placement is interaction effects. A piece that fits perfectly in isolation may block the placement of the second piece, which forces the third piece into a suboptimal position, which leaves a gap that the next three pieces can't fill. The damage compounds across turns. Players who run out of space aren't usually running out of space because of one bad decision, they're experiencing the accumulated cost of many decisions made without considering their neighbors.
The planning process: look at all three pieces together. Identify at least two candidate placements for each piece that don't block any other piece's candidates. Then evaluate which combination of three placements clears the most lines or leaves the cleanest board state. Only then place the first piece.
This takes 5 to 10 seconds longer per turn than reactive single-piece placement. It pays back 3 to 4 turns later in avoided dead ends.
Lines clear when a complete row or column is filled. The scoring rewards clearing multiple lines simultaneously, and the board management rewards clearing frequently, because an uncleared board fills quickly.
Two principles for line clearing:
Complete partially filled lines first. A row with 8 of 10 cells filled is one piece away from clearing. Prioritize placements that complete these near-full lines over placements that add to empty areas. A nearly-filled row is a committed resource, its cells are locked, and it won't clear until complete. The faster you clear it, the sooner those cells are available again.
Build lines in the same direction simultaneously. Clearing both a row and column that intersect counts as two simultaneous clears, which scores better and opens more space in one move. Placing pieces near intersections, cells that are part of both a nearly-full row and a nearly-full column, creates opportunities for double clears. These are worth prioritizing over single-direction placements.
The primary cause of board death in Block Puzzle is isolated gaps, empty cells surrounded on two or more sides by filled cells, which no piece can fill because the shape combinations don't reach them. An isolated 1×1 gap can only be filled by a single-cell piece, which doesn't exist. An isolated 1×2 gap can be filled by a 1×2 piece, but if the current or next set of three pieces doesn't include one, the gap persists and the row it's in can never clear.
Prevention: when placing a piece, look at the shape of the empty space you're leaving behind. Ask: can any common piece shape fill the gap you're creating? A gap that's an L-shape can be filled by an L-piece. A gap that's a 1×3 line can be filled by a 1×3 piece. A gap that's a 2×2 square can be filled by a 2×2 piece. A gap that's a cross or irregular polygon may be unfillable.
Prefer placements that leave rectangular or regular gaps over placements that leave irregular ones. Rectangular gaps are fillable by a wide range of piece shapes; irregular gaps restrict you to specific pieces you may not receive.
Placing pieces against the grid's edges or walls is generally preferable to placing them in the middle of open space. Edge placement constrains the piece on one or two sides, which means fewer cells need to be committed to complete any row or column adjacent to the edge. A piece placed in the center commits cells in both directions for all its dimensions; a piece placed against the right wall commits only in the leftward direction for width.
This is the Block Puzzle equivalent of the "corner strategy" in 2048, anchor high-commitment placements at the edges, where they consume less free space and are more likely to participate in line clears along the bounded dimension.
Block Puzzle trains spatial working memory and multi-step planning simultaneously. The spatial component, visualizing how pieces fit together before placing them, engages the visuospatial sketchpad (the working memory subsystem for spatial information). The planning component, considering three placements ahead, engages the prefrontal working memory system for sequential goal management.
This combination makes Block Puzzle one of the cognitively richer games in MyRin's suite. It's not just memory, not just logic, not just pattern recognition, it's the integrated deployment of all three simultaneously, under a spatial constraint that changes with every turn. The research on spatial planning tasks (Kaller et al., 2011) classifies this profile as engaging executive function, the high-level cognitive coordination system, in addition to the domain-specific spatial systems. For players who want the broadest cognitive training from a single game, Block Puzzle is among the best options in the suite.