The simplest 'cheat' is to change the system date before you open the store. The game simply allows a different item to be purchased every day of the month, 31 items in all. And here they are...
1 - Green Chaos Emerald
2 - Fire Shield
3 - Ark Shot (mini game)
4 - Amethyst Chaos Emerald
5 - Omni Chao
6 - Super Aquamarine
7 - Sonic Medly (song)
8 - Chaos Diamond
9 - Chao Egg
10 - Super Ruby
11 - Emerald Pop (mini game)
12 - Chaos Topaz
13 - Electric Shield
14 - Super Topaz
15 - Stats Card
16 - Chaos Sapphire
17 - SNK Catapult (song)
18 - Super Sapphire
19 - Bubble Shield
20 - Chaos Aquamarine
21 - Around the World (mini game)
22 - Super Emerald
23 - Basic Shield
24 - Super Diamond
25 - Egg Catcher (mini game)
26 - Chaos Ruby
27 - Space Machine OCR (song)
28 - Super Amethyst
29 - Boss Battles (mini game)
30 - Beta Emerald
31 - Floating Balloon (shield)
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you must collect the green emerald
Normal Sonic, Super Sonic, Hyper Sonic, Eco Sonic, Polar Sonic, Solar Sonic, Ultra Sonic, Dark Sonic, Darkspine Sonic, and Excalibur Sonic. (Note that these are forms of Sonic the Hedgehog)
Here is a cheat code for Sonic Robo Blast 2. Open the game menu and enter god to gain invincibility.
Yes. Just go 2 options, and select the character you want to play as: Sonic, Tails, or Sonic and Tails. NOTE: If you are just as Tails, you cannot go SUPER SONIC, however there is a cheat to go SUPER TAILS, but you need both Sonic and Tails to do this.
you can unlock a level with a pipe and cannon around it (i got it on a red flag on world 2 number 4 ) and finish that on a cheat flag( the yellow pipe above the other 1). this will unlock the cannon.