Pieces you will need:
13 Yellow connectors,
3 Red connectors,
3 Grey connectors,
3 Green connectors,
2 White connectors,
24 White rods,
20 Green rods,
2 Grey rods.

Step 1: Step 1

Get 5 Yellow connectors and 4 Green rods and put them together in a zig-zag formation.

Step 2: Step 2

Get 5 White rods and place them into the 5 Yellow rods.

Step 3: Step 3

Get 4 White rods and fill in the gaps between the yellow connectors.

Step 4: Step 4

Get a Green rod a White rod and a Red connector and clip them together. And attach to the handle.

Step 5: Step 5

Clip on two grey rods as the blade.

Step 6: Step 6

Get 4 Yellow connectors and 1 Red connector and clip onto the White rods.

Step 7: Step 7

Get 4 Green rods and 5 White rods and fill in the gaps and repeat symmetrically on the flip side.

Step 8: Step 8

Now for the handle get 1 White connector and put onto the only remaining white. Then connect the White connector and Yellow connector with a Green rod.

Step 9: Step 9

Now take 1 Grey connector, 1 Green connector, 1 White rod and 2 Green rods and put them together. Add them to the handle and repeat symmetrically on the flip side.

Step 10: Step 10

Get your last 3 pieces; the Green connector the Grey connector and the Green rod and add to the top of the blade.

Step 11: Finally

Have fun with your Knex Knife enjoy, show all of your friends, play awesome games and much more but please play responsibly as even though it isn't a real knife you can still hurt your self. Thanks and bye :)