# What's the goal in the lighthouse puzzle (and how to achieve it)?

I'm stuck in this puzzle given by the cyclops at the lighthouse. What am I trying to accomplish here and how?

• For those not wanting to just read a walkthrough: The aim is to powerup (#) the "? ?" tile. Commented Oct 26, 2013 at 19:41

So here's how it works:

• `V` blocks make a block in the direction of the V
• `T` block make a block above
• `<3` blocks power up all adjacent blocks
• `--->` blocks move the row below along one
• `|` blocks move the row to the left up one
• `#` indicates how many charges a block has

The first few clicks should be:

1. Click the V/T block, then expand out the chain of Vs to get the `--->`.
2. Make a T block by clicking the centre block
3. Move the T block along to be one block to the left underneath the ?? block
4. Click it, and expand to get a <3
5. Click the <3 to charge
6. Move it along one again and expand. You now have two adjacent <3 blocks to make an 'engine'

You can now expand out the rest of the area using the same method. You should end up with two `--->` blocks, and one `|`. You can use these blocks to move around the movement blocks so you can move an engine underneath the `??` block.

Power it up to win.

• Got it - trial and error, but the answer was certainly helpful. Commented Oct 24, 2013 at 14:03
• I can think of an easy way. A list of blocks to click on, in order. Commented Oct 26, 2013 at 23:30

The goal is to power up the [ ? ? ] block with a charge (#) and click it. If you want to know exactly how to accomplish this, read on.

I made a video of myself completing the puzzle, you can see it here:

• Letter-number combination tells you which block to click, check the image below to understand better. E3*6 means press E column, row 3, 6 times in a row.
• A charge is represented by #.
• To charge a block, you need two adjacent <3 blocks.
• REMEMBER TO CHARGE ALL BLOCKS WHEN THEY PASS THE <3 BLOCKS!!!

Here's the full description; step by step. Click blocks in the following order:

1. D3 - D2 - E2 - D3 - E3 - E3 - F4 - F3 - E3 - G4 - G3 - G2
2. Repeat F2 and F3 until the nearby blocks are fully charged and always when there is a block with low charges adjacent to one of them.
3. D3 - E3*6 - C4 - C3 - C2 - E3 - E3 - A4 - A3 - A2 - A1 - C1
4. Repeat C1 and B1 until the nearby blocks are fully charged and always when there is a block with low charges adjacent to one of them.
5. E3 - B4 - B3 - B2 - A5 - B2 - B2 - B2 - B5 - E3 - B2 - E3 - B2 - E3 - B2 - A4 - E3*6 - B2*3
6. NOTE: Video takes a longer route, here's the shortcut.
7. Charge both A1 and F2 with at least one charge.
8. A1 - G2 - G1
9. Done!

I've made a close to minimal video showing the solution. It goes quickly, but doesn't have as many steps to follow. You can find it here Lighthouse Puzzle Solution

• Can you summarize your solution here, please? That way, if the video ever goes down, your answer is still valid. Commented Oct 25, 2013 at 17:27