The tunnel uses all seven Soma pieces, 27 cubes in total. Here is one solution: first the finished figure, then the pieces one by one from the floor up, in an order you can follow with real pieces.
- Vsmall corner
- LL shape
- TT shape
- Zstep (Z shape)
- Atwist A
- Btwist B
- Pbranch
Opens the solver with this figure. Press "Next" to place one piece at a time, and drag to turn the view.
Step by step
Build in this order from the floor up, lowering each piece from above. Every piece rests on the floor or on pieces already placed.
Step 1 · Place piece V (small corner) on layer 1, at the front left. It lies flat, with its bend at the front left corner.
Step 2 · Place piece P (branch) on layers 1–2, at the front right. Three of its cubes lie on layer 1, and one sticks up onto layer 2.
Step 3 · Place piece Z (step) on layers 1–2, in the middle. It stands upright like a wall running from front to back.
Step 4 · Place piece A (twist A) on layers 1–2, at the back right. Two of its cubes are on layer 1 and two on layer 2.
Step 5 · Place piece L (L shape) on layers 1–2, on the left. It stands upright like a wall running from front to back.
Step 6 · Place piece B (twist B) on layers 1–2, at the front. Only one cube is on layer 1; the other three lie on layer 2.
Step 7 · Place piece T (T shape) on layer 2, at the back. It lies flat: a row of three from left to right, with the fourth cube sticking out to the front from the middle. All 7 pieces are in place and the figure is finished.
Layer by layer, seen from above
Layer 1 is the floor. In each plan the top edge is the back of the figure and the bottom edge is the front.
About this figure
- Size: 5 wide, 3 deep and 2 high (in cubes).
- Solutions: 294 different ones. Counting every placement separately, including turned and mirrored copies of the same solution, there are 1,176.
- Counted with this tool's solver, which tries every position of every piece. Two solutions count as the same when turning or mirroring the whole figure turns one into the other (a mirror image swaps pieces A and B).