Sonic Mania
18 Achievements
1,000
15-20h
That's a Two-fer
Uncovered two item boxes with a single Goal Plate
50
9.51%
How to unlock the That's a Two-fer achievement in Sonic Mania - Definitive Guide
Notes:
-The sign comes down where the boss was during the last hit (in GHZ at least). (Mentioned by Slim Panatella).
Credits to Shadiochao foe the video.
This can first be attained after you defeat the boss of the first act of Green Hill Zone. Playing as 'Sonic only' makes it easier as Tails can interfere when jumping with the signpost.
The signpost will land wherever the boss fell so try to destroy him when he is on top of the large sunflower on the right (as this is where one of the monitors are). When the first monitor pops up guide the signpost to the 2 purple flowers on the left to pop the second monitor and unlock the achievement
(I don't think you have to be Knuckles to get the right angle, I was just going through his storyline.)
This certainly surprised the hell out of me.
POST EDIT: Whoops! Sorry, forgot I deleted this from my Xbox clips. I've added a YouTube link so this can stay up permanently. Don'tcha just hate that?
The easiest way is to select Green Hill Zone, at the end of Act 1. After finishing the boss, the goalpost will fall from the sky and you have to jump around and direct it towards the sunflower and between the two purple flowers on the map. If you do this correctly, both item boxes should pop from the ground. Get them and the trophy will pop.
This locations never change and you can get the item boxes at the end of every boss on Act 1 of any zone.
Here is a video to illustrate all that better (made by Jerry Appleby):
This trophy can only be obtained in Mania Mode.
After the end of Act 1 of any level, you’ll see a goalpost fall from the sky and hit the ground, signifying the end of the current Act. You can jump into this post and knock it around the air before it lands. If you’re lucky, it will spawn a free item when it hits the ground. For this trophy you must get both item boxes to appear before ending the Act.
Each level has it’s own spawn points, but these locations never change. The easiest ones to get are in Act 1 of Green Hill Zone. There is 1 item box between the two purple flowers on the left, and the other is under the yellow sunflower on the right.
See the following video for a visual guide:
Location of hidden boxes
https://www.youtube.com/watch?v=bAKYcnnCi70