Tromi

Tromi
Tromi
Developer(s)	mycophobia
Platform(s)	LÖVE
Release	First release (Version 1) : December 26, 2022; Official release (Version 2) : April, 08 2024;
Latest release	April 25, 2024 (Version 2.2)
Gameplay info
Next pieces	1
Playfield size	20 × 10
Hold piece	No
Hard drop	No
Rotation system	Tromi Rotation System

Tromi is a fan game by Mycophobia. It's inspired by TGM and is a heavy modification of Cambridge. Designed to be an old-school flavour and relaxing game while modernising what is necessary to allow for modern gameplay.

Gameplay

Gravity

Gravity increases uniformly, unlike TGM series games; however, it still depends on the current level.

Level

Unlike in TGM, where level has a unique implementation, level in Tromi is simply based on your current score.

There are 10 levels in Tromi, numbered from 0 to 9, and there are 6 small steps ^[a] in every level (except level 9).

IRS

Main article: IRS

Normally a piece will appear in the rotation showed in the piece preview. With IRS, holding either the left or right rotation button will cause the piece to appear rotated 90 degrees. This allows the player a higher degree of freedom when placing pieces at higher game speeds.

Grading

Grade list
(can be seen at "Name entry" screen)
Beginner	Intermediate	Expert
19 kyu	9 kyu	1 Dan
18 kyu	8 kyu	2 Dan
17 kyu	7 kyu	3 Dan
16 kyu	6 kyu	4 Dan
15 kyu	5 kyu	5 Dan
14 kyu	4 kyu	6 Dan
13 kyu	3 kyu	7 Dan
12 kyu	2 kyu	8 Dan
11 kyu	1 kyu	9 Dan
10 kyu

Account system

Tromi has an account system like TGM3, but it doesn't have a security system such as PIN or password. That's why it doesn't require you to register any account for the first time; you only need to fill in your name to play (like in guest mode).

Grading system

Tromi has its own grading system, nominally based on the kyu/dan system of Go and Shogi, organised to correspond to specific points in the speed curve.
Both Tromi and TGM3 have their own grading systems that are designed to track performance in multiple games, but the way they work is different.

In TGM3, there is the Promotion Exam and the Demotion Exam
In Tromi, there is the Promotion Meter

Promotion Meter

Promotion Meter acts like a progress bar that shows how likely you are to be promoted or demoted. It ranges from -2 (high chance of demotion) to +2 (high chance of promotion). New players starting at 0.

After every game, your final score is compared to the table below based on your current grade. For every grade, there are 3 scores: Auto Promote, Promote, and Demote assigned to them.

If your score is higher than your grade's Promote point, Promotion Meter will be boosted by one.
On the other hand, if your score falls below your grade's Demote point, Promotion Meter will be dropped by one.

Once the Promotion Meter goes above +2, you will be promoted, but if the Promotion Meter falls below -2, you will be demoted. Both cases will lead to the Promotion Meter going back to 0.

There are two special cases:

If your score is between your grade's Promote point and Demote point, nothing will happen.
If your score exceeds your grade's Auto Promote point, you will get the highest grade that your score qualifies for.

Grade condition (required score)
Grade	Auto Promote	Promote	Demote	Grade	Auto Promote	Promote	Demote	Grade	Auto Promote	Promote	Demote
19 kyu	79,999	26,666	-1	9 kyu	346,666	293,333	180,000	1 Dan	586,666	533,333	420,000
18 kyu	106,666	53,333	13,332	8 kyu	373,333	319,999	180,000	2 Dan	613,333	559,999	420,000
17 kyu	133,333	79,999	25,000	7 kyu	399,999	346,666	240,000	3 Dan	639,999	586,666	480,000
16 kyu	159,999	106,666	40,000	6 kyu	426,666	373,333	240,000	4 Dan	666,666	613,333	480,000
15 kyu	186,666	133,333	50,000	5 kyu	453,333	399,999	300,000	5 Dan	693,333	639,999	480,000
14 kyu	213,333	159,999	60,000	4 kyu	479,999	426,666	300,000	6 Dan	719,999	666,666	480,000
13 kyu	239,999	186,666	60,000	3 kyu	506,666	453,333	360,000	7 Dan	746,666	693,333	540,000
12 kyu	266,666	213,333	120,000	2 kyu	533,333	479,999	360,000	8 Dan	773,333	719,999	540,000
11 kyu	293,333	239,999	120,000	1 kyu	559,999	506,666	360,000	9 Dan	1,000,000	719,999	540,000
10 kyu	319,999	266,666	120,000

Formulas

Level and step

{\text{Level}}=\lfloor {\text{Score}}\div 60,000\rfloor

{\text{Step}}=\lfloor {\text{Score}}\div 10,000\rfloor {\bmod {(}}{\text{Level}}\times 6)

Where:

$\lfloor {\text{Score}}\div 10,000\rfloor$ and $\lfloor {\text{Score}}\div 60,000\rfloor$ are rounded down.
Level is your current level (should only be in the range of 0 to 9).
Score is your current score.
Step is the remainder, which is your current step in your current level (should only be in the range of 1 to 6).

Scoring

Lines Bonus reward
Lines	Reward (Points)
Double	1,667
Triple	3,750
Quad	6,668
Pentad	8,335

{\text{Efficiency}}=({\text{Moves}}\div {\text{[Active frames]}})\times {\text{(0 if placement results in hole)}}

{\text{Score}}=({\text{[50 piece Avg. of Efficiency]}}\times 1666\times {\text{Lines}})+{\text{[Lines Bonus]}}

Where:

Moves is the number of cells the piece moved (including manual moves, manual soft drops, and gravity).
Active frames is the number of frames since the block spawned until the piece locked down.
Lines is the number of lines you just cleared.
Lines Bonus is the extra bonus for clearing two or more lines. Look at the table on the right to calculate

Speed timings

Dynamic value
Level	Step	Gravity (G)	ARE (frame)	Lock (frame)	DAS (frame)	Level	Step	Gravity (G)	ARE (frame)	Lock (frame)	DAS (frame)
0	1	0.013	20	30	12	5	1	0.842	20	30	12
	2	0.015	20	30	12		2	1.029	20	30	12
	3	0.016	20	30	12		3	1.323	20	30	12
	4	0.018	20	30	12		4	1.852	20	30	11
	5	0.021	20	30	12		5	3.086	20	30	10
	6	0.025	20	30	12		6	9.259	20	30	9
1	1	0.027	20	30	12	6	1	20	20	30	8
	2	0.030	20	30	12		2	20	20	30	8
	3	0.033	20	30	12		3	20	19	28	8
	4	0.038	20	30	12		4	20	18	27	8
	5	0.043	20	30	12		5	20	17	26	8
	6	0.051	20	30	12		6	20	17	25	8
2	1	0.056	20	30	12	7	1	20	16	24	8
	2	0.062	20	30	12		2	20	16	23	8
	3	0.070	20	30	12		3	20	15	23	8
	4	0.079	20	30	12		4	20	15	22	8
	5	0.092	20	30	12		5	20	14	21	8
	6	0.109	20	30	12		6	20	14	21	8
3	1	0.120	20	30	12	8	1	20	14	20	8
	2	0.134	20	30	12		2	20	13	20	8
	3	0.152	20	30	12		3	20	13	20	8
	4	0.175	20	30	12		4	20	13	19	8
	5	0.206	20	30	12		5	20	13	19	8
	6	0.250	20	30	12		6	20	13	19	8
4	1	0.281	20	30	12	9		20	12	18	8
	2	0.319	20	30	12
	3	0.370	20	30	12
	4	0.441	20	30	12
	5	0.545	20	30	12
	6	0.712	20	30	12

Fixed value
Mode	Normal	20G training
ARR (frames)	1
Drop (G)	1
DAS cut (frames)	0
DAS (frames)		8
Lock (frames)		99999999999
Gravity (G)		20
ARE (frames)		20
NOTE	Empty cells mean the value will change depending on the current level If you want to look up these values, please look at the table on the left.

Rotation system

Tromi rotation uses standard Sega orientations and colors, with an additional kick system in the case of a failed basic rotation. Exactly one kick will be attempted, and this kick is selected in the following manner:

If basic rotation fails, determine which rows and columns are blocked when the piece is rotated. Relevant rows and columns are as follows, numbered top-to-bottom and left-to-right:

   A. Row 1 (any of top row)
   B. Row 4 (any of bottom row, only applicable to vertical I)
   C. Row 2 + Column 1 (upper left)
   D. Row 3 + Column 1 (lower left)
   E. Row 2 + Column 3 or 4 (upper right)
   F. Row 3 + Column 3 or 4 (lower right)
   G. Column 2 (any of center column)

The kick selected is determined in the following order of priority:

   1. If case A, C+E, C+F, or E+D, one space down
   2. If case D+F, one space up
   3. If case C and/or D, one space right
   4. If case E and/or F, one space left
   5. If case G and the rotated piece has a mino in the left column, one space right
   6. If case G and the rotated piece has a mino in the right column, one space left
   7. If case B, one space up (this is only possible with the vertical I)

Case A mitigates the playfield having no invisible rows above it, in that if a piece is rotated from spawn position at the very top of the playfield, it will always try to kick down instead of anything else.

Floorkicks will not allow for infinite lock delay resets as lock delay is only reset when a piece steps down lower than it has ever been. A side-effect is that after a floorkick the total lock delay will be shared for the cell the piece is on and the cell directly below it; one must drop the piece at least 2 cells down after a floorkick for the lock delay to reset.

Notes

↑ In fact, in the internal code, there are not 10 levels with 6 steps each (except level 9), but 55 levels! But Tromi changes the background during gameplay 10 times only (including the one at the beginning of the game), so we can split 55 levels into 10 levels (same as the number shown on the game's screen), with every level from 0 to 8 having 6 smaller steps and the level 9 not having one

External links

[1] In fact, in the internal code, there are not 10 levels with 6 steps each (except level 9), but 55 levels! But Tromi changes the background during gameplay 10 times only (including the one at the beginning of the game), so we can split 55 levels into 10 levels (same as the number shown on the game's screen), with every level from 0 to 8 having 6 smaller steps and the level 9 not having one

[a]

Tromi

Contents

Gameplay

Gravity

Level

IRS

Grading

Account system

Grading system

Promotion Meter

Formulas

Level and step

Scoring

Speed timings

Rotation system

Notes

External links

Navigation menu

Tromi

Gameplay

Gravity

Level

IRS

Grading

Account system

Grading system

Promotion Meter

Formulas

Level and step

Scoring

Speed timings

Rotation system

Notes

External links

Navigation menu

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