2. Piece diversity: Today the total range of piece types and the number of new piece types introduced every year has skyrocketed since the decade of the 80s. As a kid, the new pieces introduced every year were indeed one of the great answers to my parents’ pleas of “don’t you already have ENOUGH Legos?!?!” However, the quantity of new piece types again coupled with the broad color diversity again requires much more Lego to be purchased to attain that “critical mass”.
The Transformers toy-line is typically divided into two main factions: the heroic Autobots and their opponents, the evil Decepticons (traditionally known in Japan as the Cybertrons and Destrons, respectively, although more recent releases often using the English terms). Transformers toys are sold at a number of price points, and various Transformers series utilize unique play features.
The second known version  ditched the triplechanging gimmick on the cab and simplified things a good bit. This Powermaster Prime has several distinct characteristics only seen in the second design, such as the wider "block head" and two faux smokestacks on top of either shoulder as opposed to one. Also, in a rather odd twist, this design features a black head and fists for both super and regular modes rather than the traditional blue. It also had yellow eyes in either mode a la the original Optimus Prime.
The first in TakaraTomy's Hybrid Style series, Galaxy Convoy is a partly die-cast figure with scaled-down equivalents of the accessories that came with the Leader-class figure. This highly-intricate figure retains all the transformation abilities of the original figure—vehicle, flight mode, robot, and Super Mode—and even its Cyber Key-activated features (even coming with two keys so they can be deployed simultaneously), with additional touches like spring-loaded mechanisms that snap his cannons into place, and hand-grips on the weapons for Super Mode. While he does lack electronics or firing missiles, Prime still includes his Matrix, super-tiny yet still removable, and has four alternate sets of hands: two clenched fists, two with pointing index fingers, two with splayed palms, and two curved hands for holding his various weapon handles. Given the figure's small size, a reconfigurable head was infeasible, so it also comes with an alternate Super Mode head with a mouthplate and crests deployed, though the standard head must be attached in order for the figure to be transformed to vehicle mode.
Part of the first wave of Siege Voyager Class figures, Optimus Prime transforms from robot to short-smokestacked Cybertronian armored truck and back. He includes two weapons compatible with the C.O.M.B.A.T. System—the "W-50 Dual-Mech Energon Strikeshield", which is an axe that transforms into a shield, and the "W-M3 RF Ion Blaster". Both weapons can combine to form the "Sentrystrike Ultra-Blaster". Optimus Prime also features "battle damage" paint applications on several parts of his body, as well as multiple hardpoints all over himself and his weapons to accommodate "Fire Blasts" from the Battle Masters assortment, which can be used to simulate blaster fire or explosions.
Part of the first wave of Bot Shots Series 1 launchers, this repaint of Optimus Prime comes with a large trailer that pops open to form a battle station with a spring-loaded launching platform. He appears to have the same plastic colors as the single release, and the same set of paint operations, but his paint is done in different shades, having glossy dark blue paint and glossy bright red paint. The black part of his launcher is sculpted to look vaguely like the repair done that is part of Generation 1 Optimus Prime's repair bay.
Optimus Prime grew concerned when Hound picked up a communication from Laserbeak that indicated the Decepticons had grown interested in a mysterious structure near a human village. Prime and a team of Autobots headed out to investigate, and they battled the Decepticons over the structure, which turned out to be a harmless windmill. Laserbeak's Fury
This gold vacuum metallized (save for his black joints, which they were made out of unpaintable plastic) Protoform Optimus Prime figure was featured as a Lucky Draw giveaway (along side similarly gold vac-metal versions of Voyager class Optimus Prime and Protoform Starscream) in the December 2007 issue of TV Magazine. Released in 2008, only 5 pieces were made, making it one of the rarest Lucky Draw figures; the images at right represent the only known photographs of it.