## 4 Results and Discussion  
In this phase, we analyze the results with automatic and manual evaluation tools. Applying descriptive statistics to the evaluation data with the CCA and PEAT tools, we have that the mean value is 3.9, the standard error is 0.21; the median is 5.0, the mode is 5.0, the standard deviation is 1.9,  
Figure 3: Manual evaluation of serious games. the variance of the sample is 3.64, the minimum value is 1.0, the maximum is 7.0. Figure 4 shows the evaluation with the CCA and PEAT tools; we found that 24 serious games meet from 1 to 2.5 in the evaluated contrast and photosensitivity parameters, 10 serious games meet from 2.5 to 4, the next 30 from 4 to 5.5, and 18 serious games meet of 5.5 to 7 points. From the data in Table 3, we find that the 82 serious games passed the photosensitivity test. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Guideline** & **Barrier** & \
\begin{tabular}{c} **WCAG 2.1** \\ **(Principle)** \\ \end{tabular} &
\begin{tabular}{c} **Success** \\ **Criteria** \\ \end{tabular} & **Level** & **Total** & **\%** \\ \hline G01 & Accessible keyboard & Operable & 2.1.1 & A & 8 & 1.3 \\ G02 & Luminance flash failures & Operable & 2.3.1 & A & 81 & 13 \\ G03 & Animation from Interactions & Operable & 2.3.3 & AAA & 27 & 4.2 \\ G04 & Content hovering over focus & Perceivable & 1.4.13 & AA & 6 & 0.9 \\ G05 & Easy to read font & Perceivable & 1.1.1 & A & 82 & 13 \\ G06 & Text alternatives & Perceivable & 1.1.1 & A & 1 & 0.2 \\ G07 & Subtitled & Perceivable & 1.2.4 & AA & 0 & 0 \\ G08 & Automatic transcripts & Perceivable & 1.2.5 & AA & 0 & 0 \\ G09 & Sign language & Perceivable & 1.2.6 & AAA & 0 & 0 \\ G10 & Information and relationships & Perceivable & 1.3.1 & A & 0 & 0 \\ G11 & Sensory characteristics & Perceivable & 1.3.1 & A & 0 & 0 \\ G12 & Adjust display settings & Perceivable & 1.3.4 & AA & 0 & 0 \\ G13 & Interface rearrangement & Perceivable & 1.3.5 & AA & 0 & 0 \\ G14 & Use of color & Perceivable & 1.4.1 & A & 32 & 5 \\ G15 & Contrast without text & Perceivable & 1.4.11 & AA & 2 & 0.3 \\ G16 & Well-spaced elements & Perceivable & 1.4.12 & A & 82 & 13 \\ G17 & Good audio techniques & Perceivable & 1.4.2 & A & 20 & 3.1 \\ G18 & Contrast (Minimum) & Perceivable & 1.4.3 & AA & 62 & 9.7 \\ G19 & Images as sharp as possible & Perceivable & 1.4.5 & AA & 2 & 0.3 \\ G20 & Visual presentation & Perceivable & 1.4.8 & AAA & 12 & 1.9 \\ G21 & Pause, stop, hide & Perceivable & 2.2.2 & A & 27 & 4.2 \\ G22 & Contrast (Enhanced) & Perceivable & 1.4.6 & AAA & 20 & 3.1 \\ G23 & Screen reader support & Robust & 4.1.2 & A & 0 & 0 \\ G24 & Status messages & Robust & 4.1.3 & AA & 0 & 0 \\ G25 & Language & Understandable & 3.1.1 & A & 82 & 13 \\ G26 & Consistent navigation & Understandable & 3.2.3 & AA & 82 & 13 \\ G27 & Labels or instructions & Understandable & 3.3.2 & A & 5 & 0.8 \\ G28 & Help & Understandable & 3.3.5 & AAA & 0 & 0 \\ G29 & On Focus & Understandable & 3.2.1 & A & 6 & 0.9 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Summary of Accessibility Evaluation in Serious Games with the Manual Method. Figure 4: Evaluation of serious games with CCA and PEAT. Table 3 shows a summary of the manual evaluation of 82 serious games; it contains the guideline, barrier, accessibility principle, success criteria, level, total, and percentage of accessibility evaluation in serious games with the manual method. The total column shows the value of the guidelines that exceed the barrier. We found that the 82 serious games compliance the following guidelines: (1) G05 related to easy to read font, (2) G16 related to well-spaced elements, (3) G25 related to language, (4) G26 related to consistent navigation. Figure 5 shows the percentage of compliance with accessibility principles of the 82 serious games evaluated. We found that the perceptible principle is fulfilled in 54.4% of the total, the comprehensible one registers 27.4% of fulfillment, the operable one registers 18.2%, and the robust one registers 0.0%.