He achieves light-speed with his Light speed attacks and dash alone, downplayer.
You don't have to defend anything with me.
Also, when he's Super Sonic, he also moves at FTL speeds, downplayer. You may want to keep your game mechanics to yourself. I've shown in multiple cases why he's light speed (capable of keeping up with and catching a Wisp specifically made to be a laser, is stated to be light speed by two WOG comments, from the History of Sonic the Hedgehog, and the Sonic the Hedgehog Super Interactive Annual 2014, as well as the fact that he could outrun a, though fake, black hole for a time. He's also commented as the fastest in the entire universe in instruction booklets.
All you're saying that just because the game mechanics don't fit how you wish them to, that it gives the Word of God less credibility. Wrong way to see it, bucko. But we all have our way of perceiving things, and that's just what you want to do, and that's completely fine. But don't come discounting feats just because you rely on game mechanics. Especially when one of those game mechanic feats has him running at speeds far faster than the speed of light (when doing a Lightspeed dash in Sonic Unleashed a light speed dash is 396 SPD compared to Sonic running at a staggering 2800 SPD).
So, by that notion, if we use your way, Sonic would already be Lightspeed without having to take WoG into count, actually, far faster than it. Ironically, The History of Sonic the Hedgehog states in Sonic Unleashed that Sonic can move at light speed, too.
So anymore game mechanics you need to talk about here, bub?