Abstract: A pairing block set has a right-hand toy block and a left-hand toy block, each of mutual, mirror symmetry and optionally incorporating a system of eight abutment points to each engaged studs on its mating block upon assembling. By providing two different layouts—one for the odd number, and one for the even number tier toy block groups respectively, using a combination of the pairing block set and other commonly seen basic type of blocks for each tier groups, and after stacking up tiers of block groups by different layouts alternatingly, in a tier-to-tier mutual interlocking manner, a structurally sound assembly of an oblique sided structure can be built with smoothly lined sides or walls. A plurality of latches is left at both ends of the assembly, to be further interlocked with its neighboring, mating toy blocks of the intended final structure.

Abstract: A pairing block set having a Right-hand Wedged Block and a Left-hand Wedged Block, each of mutual, mirror symmetry, is provided. Each may optionally incorporate a system of eight abutment points to each engaged Studs on its mating blocks upon assembling. By providing two different layouts—one for the odd number, and one for the even number tier toy block groups respectively, using a combination of the said pairing block set and other commonly seen Basic type of blocks for each tier groups, and after stacking up tiers of block groups by different layouts alternatingly, in a tier-to-tier mutual interlocking manner, a structurally sound assembly of oblique sided structure can be built with smoothly lined sides or walls; while leaving a plurality of Latches at both ends of the assembly, to be further interlocked with its neighboring, mating toy blocks of the intended final structure.