original T-shirt

April Fools' page

This is the original T-shirt. It is not for sale, you have to win it!

You get this T-shirt as one of the prizes in the Puzzle Championship, Nikoli Derby and in other nikoli events.

The T-shirts are made of thick, durable cotton fabric. If you are lucky enough to get one of these very special T-shirts, wear it to show off in your neighborhood. original T-shirt (2015 version)


Size of the T-shirts original T-shirts are made in standard Japanese mens sizes. For detailed information of the sizes, please refer to the table below.

SizeColorLengthChestSleeves lengthSize of the T-shirts
XLMedium blueXL78cm58cm24cm